mediatek: mt8192: add GPIO driver support

add GPIO driver

Change-Id: I67a9abef078e7a62b34dfbd366b45c03892800cd
diff --git a/plat/mediatek/mt8192/bl31_plat_setup.c b/plat/mediatek/mt8192/bl31_plat_setup.c
index f965281..9a01bef 100644
--- a/plat/mediatek/mt8192/bl31_plat_setup.c
+++ b/plat/mediatek/mt8192/bl31_plat_setup.c
@@ -15,6 +15,7 @@
 #include <lib/coreboot.h>
 
 /* Platform Includes */
+#include <gpio/mtgpio.h>
 #include <mt_gic_v3.h>
 #include <plat_params.h>
 #include <plat_private.h>
@@ -83,6 +84,7 @@
 	/* Initialize the GIC driver, CPU and distributor interfaces */
 	mt_gic_driver_init();
 	mt_gic_init();
+	plat_mt8192_gpio_init();
 }
 
 /*******************************************************************************