feat(mt8188): add MCUSYS support

Add MCUSYS drivers support for MT8188.

Change-Id: I84107702a9fd021c37d2997ad25b321a483a1a66
diff --git a/plat/mediatek/mt8188/platform.mk b/plat/mediatek/mt8188/platform.mk
index aaf9775..765589b 100644
--- a/plat/mediatek/mt8188/platform.mk
+++ b/plat/mediatek/mt8188/platform.mk
@@ -33,6 +33,7 @@
 MODULES-y += $(MTK_PLAT)/drivers/gpio
 MODULES-y += $(MTK_PLAT)/drivers/iommu
 MODULES-y += $(MTK_PLAT)/drivers/lpm
+MODULES-y += $(MTK_PLAT)/drivers/mcusys
 MODULES-y += $(MTK_PLAT)/drivers/pmic
 MODULES-y += $(MTK_PLAT)/drivers/pmic_wrap
 MODULES-y += $(MTK_PLAT)/drivers/rtc