dev: gcdb: Add return status for gcdb init

Add error codes and success return status
for gcdb initialization function

Change-Id: I5613a712ddae8a180301d4e1f8ad7d628d7b3922
diff --git a/dev/gcdb/display/gcdb_display.h b/dev/gcdb/display/gcdb_display.h
index 16dd2c0..4811015 100755
--- a/dev/gcdb/display/gcdb_display.h
+++ b/dev/gcdb/display/gcdb_display.h
@@ -55,7 +55,7 @@
 						struct msm_panel_info *pinfo);
 int target_ldo_ctrl(uint8_t enable);
 
-void gcdb_display_init(unsigned int rev, void *base);
+int gcdb_display_init(uint32_t rev, void *base);
 void gcdb_display_shutdown();
 
 #endif /*_GCDB_DISPLAY_H_ */