feat(mt8188): add RTC support

TEST=build pass.
BUG=b:233720142

Signed-off-by: Song Fan <ot_song.fan@mediatek.corp-partner.google.com>
Change-Id: I348eff0f53341593f74a63780e2e8298cbc3ec88
diff --git a/plat/mediatek/mt8188/platform.mk b/plat/mediatek/mt8188/platform.mk
index 4743164..6f72954 100644
--- a/plat/mediatek/mt8188/platform.mk
+++ b/plat/mediatek/mt8188/platform.mk
@@ -28,6 +28,7 @@
 MODULES-y += $(MTK_PLAT)/drivers/iommu
 MODULES-y += $(MTK_PLAT)/drivers/pmic
 MODULES-y += $(MTK_PLAT)/drivers/pmic_wrap
+MODULES-y += $(MTK_PLAT)/drivers/rtc
 MODULES-y += $(MTK_PLAT)/drivers/timer
 
 PLAT_BL_COMMON_SOURCES := common/desc_image_load.c \