fix(mt8196): remove EC_SUSPEND_PIN initial setting

Move EC_SUSPEND_PIN (GPIO_AP_SUSPEND_L) init to coreboot and remove
EC_SUSPEND_PIN init from TF-A.

Change-Id: I3d7a5a923dc9f692495d99255427a39ef5852bf8
diff --git a/plat/mediatek/drivers/spm/mt8196/mt_spm.c b/plat/mediatek/drivers/spm/mt8196/mt_spm.c
index 9b1dc92..2a82089 100644
--- a/plat/mediatek/drivers/spm/mt8196/mt_spm.c
+++ b/plat/mediatek/drivers/spm/mt8196/mt_spm.c
@@ -427,12 +427,6 @@
 }
 #endif
 
-static void spm_gpio_init(void)
-{
-	gpio_set_direction(EC_SUSPEND_PIN, GPIO_DIR_OUT);
-	gpio_set_value(EC_SUSPEND_PIN, GPIO_LEVEL_HIGH);
-}
-
 int spm_boot_init(void)
 {
 	plat_spm_lock_init();
@@ -450,8 +444,6 @@
 #if defined(MT_SPM_FEATURE_SUPPORT)
 	spm_hwreq_init();
 #endif
-	spm_gpio_init();
-
 	spm_irq_num = 0xFFFFFFFF;
 
 	INFO("[%s], PC = 0x%x\n", __func__, mmio_read_32(MD32PCM_PC));