refactor(mediatek): refactor plat_sip_calls.h for mt8192/mt8195/mt8186

- MTK_SIP_KERNEL_DFD can be moved to mtk_sip_def.h.
- Remove unused MTK_SIP_* definations which are already defined in
  mtk_sip_def.h.

Change-Id: Ife8f1e842d986691488548632426f194199d42b9
diff --git a/plat/mediatek/include/mtk_sip_def.h b/plat/mediatek/include/mtk_sip_def.h
index d760101..7449371 100644
--- a/plat/mediatek/include/mtk_sip_def.h
+++ b/plat/mediatek/include/mtk_sip_def.h
@@ -10,6 +10,7 @@
 /* Define SiP SMC ID here */
 #define MTK_SIP_SMC_FROM_NS_EL1_TABLE(_func) \
 	_func(MTK_SIP_KERNEL_TIME_SYNC, 0x202) \
+	_func(MTK_SIP_KERNEL_DFD, 0x205) \
 	_func(MTK_SIP_VCORE_CONTROL, 0x506) \
 	_func(MTK_SIP_IOMMU_CONTROL, 0x514) \
 	_func(MTK_SIP_APUSYS_CONTROL, 0x51E) \