tools/ci.sh: Build both SAMD21 and SAMD51 boards as part of samd CI.

Signed-off-by: Damien George <damien@micropython.org>

tools/ci.sh

@@ -309,7 +309,8 @@ function ci_samd_setup {
 function ci_samd_build {
     make ${MAKEOPTS} -C mpy-cross
     make ${MAKEOPTS} -C ports/samd submodules
-    make ${MAKEOPTS} -C ports/samd
+    make ${MAKEOPTS} -C ports/samd BOARD=ADAFRUIT_ITSYBITSY_M0_EXPRESS
+    make ${MAKEOPTS} -C ports/samd BOARD=ADAFRUIT_ITSYBITSY_M4_EXPRESS
 }
 
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