<h3>Contribution description</h3>
<p>Use the new common 'lowercase' function from makefiles/utils.</p>
<p>The <code>lowercase</code> function was added based on the <code>lc</code> implementation in <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="486911614" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/12119" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/12119/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/12119">#12119</a><br>
So now use the common version.</p>
<h3>Testing procedure</h3>
<p>When one of the <code>priv_symbol</code> is defined, (I will set <code>MEMORY_BASE</code>), the output is the same as in master.<br>
No idea what it does, it just kept the behavior.</p>
<details><summary><code>for board in pic32-clicker pic32-wifire; do MEMORY_BASE=set_a_random_value BOARD=${board} make --no-print-directory -C examples/hello-world/ info-debug-variable-LINKFLAGS; done | sed "s|${PWD}/||g"</code></summary>
<pre><code>for board in pic32-clicker pic32-wifire; do MEMORY_BASE=set_a_random_value BOARD=${board} make --no-print-directory -C examples/hello-world/ info-debug-variable-LINKFLAGS; done | sed "s|${PWD}/||g" 
-luhi -msoft-float -Wl,--defsym,__memory_base=set_a_random_value -T bootcode.ld -Lcpu/mips_pic32mx/ldscripts -EL -mabi=32 -g3 -Os -Wl,--gc-sections -Wl,--defsym,__use_excpt_boot=0 -DDEVELHELP -Werror -std=gnu99 -EL -mabi=32 -ffunction-sections -fno-builtin -fshort-enums -fdata-sections -Os -g3 -msoft-float -march=m4k -DSKIP_COPY_TO_RAM -DRIOT_APPLICATION="hello-world" -DBOARD_PIC32_CLICKER="pic32-clicker" -DRIOT_BOARD=BOARD_PIC32_CLICKER -DCPU_MIPS_PIC32MX="mips_pic32mx" -DRIOT_CPU=CPU_MIPS_PIC32MX -DMCU_MIPS_PIC32MX="mips_pic32mx" -DRIOT_MCU=MCU_MIPS_PIC32MX -fno-common -Wall -Wextra -Wmissing-include-dirs -fno-delete-null-pointer-checks -Wstrict-prototypes -Wold-style-definition -Wformat=2 -include examples/hello-world/bin/pic32-clicker/riotbuild/riotbuild.h -Tpic32mx512_12_128_uhi.ld -lc
-luhi -msoft-float -Wl,--defsym,__memory_base=set_a_random_value -T bootcode.ld -Lcpu/mips_pic32mz/ldscripts -EL -mabi=32 -g3 -Os -Wl,--gc-sections -Wl,--defsym,__use_excpt_boot=0 -DDEVELHELP -Werror -std=gnu99 -EL -mabi=32 -ffunction-sections -fno-builtin -fshort-enums -fdata-sections -Os -g3 -msoft-float -march=m5101 -mmicromips -DSKIP_COPY_TO_RAM -DMIPS_MICROMIPS -DRIOT_APPLICATION="hello-world" -DBOARD_PIC32_WIFIRE="pic32-wifire" -DRIOT_BOARD=BOARD_PIC32_WIFIRE -DCPU_MIPS_PIC32MZ="mips_pic32mz" -DRIOT_CPU=CPU_MIPS_PIC32MZ -DMCU_MIPS_PIC32MZ="mips_pic32mz" -DRIOT_MCU=MCU_MIPS_PIC32MZ -fno-common -Wall -Wextra -Wmissing-include-dirs -fno-delete-null-pointer-checks -Wstrict-prototypes -Wold-style-definition -Wformat=2 -include examples/hello-world/bin/pic32-wifire/riotbuild/riotbuild.h -Tpic32mz2048_uhi.ld -lc
</code></pre>
</details>
<h3>Issues/PRs references</h3>
<p>Using functions defined in <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="486911614" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/12119" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/12119/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/12119">#12119</a></p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/RIOT-OS/RIOT/pull/12341'>https://github.com/RIOT-OS/RIOT/pull/12341</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>makefiles/arch/mips.inc.mk: use makefiles/utils lowercase function</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12341/files#diff-0">makefiles/arch/mips.inc.mk</a>
    (5)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/12341.patch'>https://github.com/RIOT-OS/RIOT/pull/12341.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/12341.diff'>https://github.com/RIOT-OS/RIOT/pull/12341.diff</a></li>
</ul>

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