feat(mediatek): add smcc call for MSDC

Some registers of MSDC need to be set in ATF, so we add MSDC drivers.

Change-Id: Idde51a136ad08dbaece0bdaa804b934fca7046b6
diff --git a/plat/mediatek/mt8186/include/plat_sip_calls.h b/plat/mediatek/mt8186/include/plat_sip_calls.h
index 2b99fdb..f5c15e3 100644
--- a/plat/mediatek/mt8186/include/plat_sip_calls.h
+++ b/plat/mediatek/mt8186/include/plat_sip_calls.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, MediaTek Inc. All rights reserved.
+ * Copyright (c) 2021-2022, MediaTek Inc. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -10,6 +10,6 @@
 /*******************************************************************************
  * Plat SiP function constants
  ******************************************************************************/
-#define MTK_PLAT_SIP_NUM_CALLS		(4)
+#define MTK_PLAT_SIP_NUM_CALLS		(6)
 
 #endif /* PLAT_SIP_CALLS_H */
diff --git a/plat/mediatek/mt8186/include/platform_def.h b/plat/mediatek/mt8186/include/platform_def.h
index f3d15f3..850ce2f 100644
--- a/plat/mediatek/mt8186/include/platform_def.h
+++ b/plat/mediatek/mt8186/include/platform_def.h
@@ -72,6 +72,11 @@
 #define EMI_MPU_BASE		(IO_PHYS + 0x0021B000)
 
 /*******************************************************************************
+ * MSDC related constants
+ ******************************************************************************/
+#define MSDC0_BASE		(IO_PHYS + 0x01230000)
+
+/*******************************************************************************
  * GIC-600 & interrupt handling related constants
  ******************************************************************************/
 /* Base MTK_platform compatible GIC memory map */