feat(mt8188): add display port control in SiP service

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

TEST=build pass
BUG=b:236331724

Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Change-Id: I0aa0675f07c80aab4349493bfbb0782bf0bbef58
diff --git a/plat/mediatek/include/mt8188/platform_def.h b/plat/mediatek/include/mt8188/platform_def.h
index 88a9e46..15ea5b6 100644
--- a/plat/mediatek/include/mt8188/platform_def.h
+++ b/plat/mediatek/include/mt8188/platform_def.h
@@ -42,6 +42,14 @@
 #define CIRQ_SPI_START		(96)
 
 /*******************************************************************************
+ * DP related constants
+ ******************************************************************************/
+#define EDP_SEC_BASE		(IO_PHYS + 0x0C504000)
+#define DP_SEC_BASE		(IO_PHYS + 0x0C604000)
+#define EDP_SEC_SIZE		(0x1000)
+#define DP_SEC_SIZE		(0x1000)
+
+/*******************************************************************************
  * System counter frequency related constants
  ******************************************************************************/
 #define SYS_COUNTER_FREQ_IN_HZ	(13000000)