<h3>Contribution description</h3>
<p>This PR defines a small API to use MCU internal temperature sensor. Such sensors are available in several MCUs that RIOT support (e.g: Kinetis, STM32, nRF52, SAM0...)</p>
<p>The API is minimalist and only consist of an init and a read functions.</p>
<p>All comments are very welcome ! (especially about naming or API itself)</p>
<h3>Testing procedure</h3>
<p>None.</p>

<h3>Issues/PRs references</h3>
<p>None.</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/11693'>https://github.com/RIOT-OS/RIOT/pull/11693</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>drivers/include: add header for internal temp periph</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>A</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/11693/files#diff-0">drivers/include/periph/temp.h</a>
    (69)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/11693.patch'>https://github.com/RIOT-OS/RIOT/pull/11693.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/11693.diff'>https://github.com/RIOT-OS/RIOT/pull/11693.diff</a></li>
</ul>

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