mediatek: mt8183: add MTK uart driver for controlling clock gate

Add uart clock gate contol for suspend/resume scenario.

Change-Id: Id4197b0720630ec6c74aec206a9b206511bf515a
diff --git a/plat/mediatek/mt8183/platform.mk b/plat/mediatek/mt8183/platform.mk
index 09fd133..3053a87 100644
--- a/plat/mediatek/mt8183/platform.mk
+++ b/plat/mediatek/mt8183/platform.mk
@@ -13,6 +13,7 @@
                  -I${MTK_PLAT_SOC}/drivers/gpio/                  \
                  -I${MTK_PLAT_SOC}/drivers/pmic/                  \
                  -I${MTK_PLAT_SOC}/drivers/rtc/                   \
+                 -I${MTK_PLAT_SOC}/drivers/uart/                  \
                  -I${MTK_PLAT_SOC}/include/
 
 PLAT_BL_COMMON_SOURCES := lib/xlat_tables/aarch64/xlat_tables.c       \
@@ -47,6 +48,7 @@
                    ${MTK_PLAT_SOC}/drivers/rtc/rtc.c                     \
                    ${MTK_PLAT_SOC}/drivers/spmc/mtspmc.c                 \
                    ${MTK_PLAT_SOC}/drivers/gpio/mtgpio.c                 \
+                   ${MTK_PLAT_SOC}/drivers/uart/uart.c                   \
                    ${MTK_PLAT_SOC}/plat_pm.c                             \
                    ${MTK_PLAT_SOC}/plat_topology.c                       \
                    ${MTK_PLAT_SOC}/plat_mt_gic.c                         \