boards: mec15xxevb_assy6853: Enable pwm sanitycheck

Enable following sanitychecks

mec15xxevb_assy6853/samples/basic/servo_motor/sample.servo_motor
mec15xxevb_assy6853/tests/drivers/pwm/pwm_api/peripheral.pwm

Run with: sanitycheck -t pwm -p mec15xxevb_assy6853

Signed-off-by: Andrei Emeltchenko <[email protected]>

Author: finikorg

boards/arm/mec15xxevb_assy6853/mec15xxevb_assy6853.yaml

@@ -18,3 +18,4 @@ supported:
   - i2c
   - pinmux
   - espi
+  - pwm