feat(plat/mdeiatek/mt8195): add display port control in SiP service

MTK display port mute/unmute control registers need to be
set in secure world.

Change-Id: Iec73650e937bd20e25c18fa28d55ae29e68b10d3
diff --git a/plat/mediatek/mt8195/aarch64/platform_common.c b/plat/mediatek/mt8195/aarch64/platform_common.c
index 745e547..a9314ea 100644
--- a/plat/mediatek/mt8195/aarch64/platform_common.c
+++ b/plat/mediatek/mt8195/aarch64/platform_common.c
@@ -17,6 +17,10 @@
 			MT_DEVICE | MT_RW | MT_SECURE),
 	MAP_REGION_FLAT(MTK_DEV_RNG2_BASE, MTK_DEV_RNG2_SIZE,
 			MT_DEVICE | MT_RW | MT_SECURE),
+	MAP_REGION_FLAT(DP_SEC_BASE, DP_SEC_SIZE,
+			MT_DEVICE | MT_RW | MT_SECURE),
+	MAP_REGION_FLAT(eDP_SEC_BASE, eDP_SEC_SIZE,
+			MT_DEVICE | MT_RW | MT_SECURE),
 	{ 0 }
 };