Add the red LED to indicate the fastboot mode

Change-Id: I87726bdad159f1dd43aec819079473b772e6adfc
diff --git a/include/configs/mt8516-coral.h b/include/configs/mt8516-coral.h
index f9a981c..ff73cac 100644
--- a/include/configs/mt8516-coral.h
+++ b/include/configs/mt8516-coral.h
@@ -96,6 +96,8 @@
 		"gpio input 42;" \
 		"if test $? -eq 0 || test \"${force_fastboot}\" -eq 1; then " \
 			"setenv force_fastboot 0; saveenv;" \
+			"gpio clear 19;" \
+			"gpio set 18;" \
 			"run fastboot;" \
 			"run mmcboot;" \
 		"else " \