feat(mediatek): add vcp driver support

It is excepted that kernel vcp can request the vcp hw do
some security setting via SMC call services.

Signed-off-by: Xiangzhi Tang <xiangzhi.tang@mediatek.corp-partner.google.com>
Change-Id: Ib5c01c1d72b3483262dcd821878e6e53ba9c681c
diff --git a/plat/mediatek/include/mtk_sip_def.h b/plat/mediatek/include/mtk_sip_def.h
index a86a46c..ff12408 100644
--- a/plat/mediatek/include/mtk_sip_def.h
+++ b/plat/mediatek/include/mtk_sip_def.h
@@ -17,7 +17,8 @@
 	_func(MTK_SIP_AUDIO_CONTROL, 0x517) \
 	_func(MTK_SIP_APUSYS_CONTROL, 0x51E) \
 	_func(MTK_SIP_DP_CONTROL, 0x523) \
-	_func(MTK_SIP_KERNEL_GIC_OP, 0x526)
+	_func(MTK_SIP_KERNEL_GIC_OP, 0x526) \
+	_func(MTK_SIP_KERNEL_VCP_CONTROL, 0x52C)
 
 #define MTK_SIP_SMC_FROM_S_EL1_TABLE(_func) \
 	_func(MTK_SIP_TEE_MPU_PERM_SET, 0x031)