boards: microchip: sam_e54_xpro: add Comparator to supported list

Update sam_e54_xpro.yml to include Comparator in the supported
features list.

Signed-off-by: Arunprasath P <arunprasath.p@microchip.com>

Author: ArunMCHP

boards/microchip/sam/sam_e54_xpro/sam_e54_xpro.yaml

@@ -11,6 +11,7 @@ flash: 1024
 ram: 256
 supported:
   - clock_control
+  - comparator
   - flash
   - gpio
   - mcuboot