feat(plat/mediatek/apu): add mt8192 APU SiP call support

Add APU SiP call support for start/stop mcu.

Change-Id: Ibf93d8ccf22c414de3093cee9e13f7668588f69e
diff --git a/plat/mediatek/common/mtk_sip_svc.h b/plat/mediatek/common/mtk_sip_svc.h
index 45ce281..74b17b6 100644
--- a/plat/mediatek/common/mtk_sip_svc.h
+++ b/plat/mediatek/common/mtk_sip_svc.h
@@ -35,6 +35,10 @@
 #define MTK_SIP_VCORE_CONTROL_ARCH32		0x82000506
 #define MTK_SIP_VCORE_CONTROL_ARCH64		0xC2000506
 
+/* APUSYS SMC call */
+#define MTK_SIP_APUSYS_CONTROL_AARCH32		0x8200051E
+#define MTK_SIP_APUSYS_CONTROL_AARCH64		0xC200051E
+
 /* Mediatek SiP Calls error code */
 enum {
 	MTK_SIP_E_SUCCESS = 0,