[sam] Add support for MCAN peripheral

Author: rleh

README.md

@@ -173,7 +173,7 @@ Please [discover modm's peripheral drivers for your specific device][discover].
 <td align="center">✅</td>
 <td align="center">✕</td>
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-<td align="center">○</td>
+<td align="center">✅</td>
 <td align="center">✕</td>
 <td align="center">✕</td>
 <td align="center">○</td>