machine/samd51: update to accomodate differences in updated SVD files for from main CMSIS-SVD repo

Signed-off-by: Ron Evans <[email protected]>

Author: deadprogram

src/machine/board_itsybitsy-m4.go

@@ -74,7 +74,7 @@ const (
 
 // SPI on the ItsyBitsy M4.
 var (
-	SPI0 = SPI{Bus: sam.SERCOM1_SPI,
+	SPI0 = SPI{Bus: sam.SERCOM1_SPIM,
 		SCK:   SPI0_SCK_PIN,
 		MOSI:  SPI0_MOSI_PIN,
 		MISO:  SPI0_MISO_PIN,