mediatek: mt8192: Add SPMC driver

Add SPMC driver for CPU power on/off.

Change-Id: I526b98d5885855efce019dd09cfd93b8816cbf19
diff --git a/plat/mediatek/mt8192/platform.mk b/plat/mediatek/mt8192/platform.mk
index 7544b26..e1da9c1 100644
--- a/plat/mediatek/mt8192/platform.mk
+++ b/plat/mediatek/mt8192/platform.mk
@@ -11,6 +11,7 @@
                  -I${MTK_PLAT_SOC}/include/                       \
                  -I${MTK_PLAT_SOC}/drivers/                       \
                  -I${MTK_PLAT_SOC}/drivers/gpio/                  \
+                 -I${MTK_PLAT_SOC}/drivers/spmc/                  \
                  -I${MTK_PLAT_SOC}/drivers/timer/
 
 GICV3_SUPPORT_GIC600        :=      1
@@ -39,9 +40,9 @@
                    ${MTK_PLAT_SOC}/plat_mt_gic.c                         \
                    ${MTK_PLAT_SOC}/plat_mt_cirq.c                        \
                    ${MTK_PLAT_SOC}/drivers/gpio/mtgpio.c                 \
+                   ${MTK_PLAT_SOC}/drivers/spmc/mtspmc.c                 \
                    ${MTK_PLAT_SOC}/drivers/timer/mt_timer.c
 
-
 # Configs for A76 and A55
 HW_ASSISTED_COHERENCY := 1
 USE_COHERENT_MEM := 0