mb/google/brask: add the mkbp device

In order to let the ec passing the key event like recovery and power key
to the OS, we need to include EC_ENABLE_MKBP_DEVICE to generate the MKBP
device.

BUG=b:204519353, b:204512547
BRANCH=None
TEST=pressed recovery key and power button in the OS and checked the UI
     behavior.

Change-Id: Ia1d0b9b301994ad9a0f4bf28b75ab0310a1d63a0
Signed-off-by: Zhuohao Lee <zhuohao@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58744
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/mainboard/google/brya/variants/baseboard/brask/include/baseboard/ec.h

@@ -32,6 +32,8 @@
 /*
  * ACPI related definitions for ASL code.
  */
+/* Enable cros_ec_keyb device */
+#define EC_ENABLE_MKBP_DEVICE
 #define EC_ENABLE_WAKE_PIN      GPE_EC_WAKE
 /* Enable EC backed PD MCU device in ACPI */
 #define EC_ENABLE_PD_MCU_DEVICE