google/chromeec: Add new helper function to read MKBP events

This change adds a new helper function google_chromeec_get_mkbp_event
that allows coreboot to query EC for the next available MKBP event.

Change-Id: Ia6d64586ca62378d08025c96c2689c00c816041f
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/22007
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

src/ec/google/chromeec/ec.h

@@ -126,4 +126,10 @@ struct google_chromeec_event_info {
 void google_chromeec_events_init(const struct google_chromeec_event_info *info,
 					bool is_s3_wakeup);
 
+/*
+ * Get next available MKBP event in ec_response_get_next_event. Returns 0 on
+ * success, < 0 otherwise.
+ */
+int google_chromeec_get_mkbp_event(struct ec_response_get_next_event *event);
+
 #endif /* _EC_GOOGLE_CHROMEEC_EC_H */