<h3>Contribution description</h3>
<p>This PR namespace the <code>samr21-xpro</code> board init to allow overriding the <code>board_init</code> sequence when inheriting from this <code>BOARD</code> for external <code>BOARD</code>s</p>
<h3>Testing procedure</h3>
<ul>
<li>Murdock should take care of this</li>
</ul>

<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/16481'>https://github.com/RIOT-OS/RIOT/pull/16481</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>boards/samr21-xpro: namespace board_init</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/16481/files#diff-8abb3ddb0a62914a087bb38bf0a8e0d065425fe481de7ed2041d5cfa8ab11f33">boards/samr21-xpro/board.c</a>
    (7)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/16481.patch'>https://github.com/RIOT-OS/RIOT/pull/16481.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/16481.diff'>https://github.com/RIOT-OS/RIOT/pull/16481.diff</a></li>
</ul>

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