feat(mt8188): add MT8188 SPM support

Add SPM basic functions including SPM init.

Change-Id: I5d4860685c15f3b8d555e697837862287f0c303e
diff --git a/plat/mediatek/drivers/spm/rules.mk b/plat/mediatek/drivers/spm/rules.mk
new file mode 100644
index 0000000..b7128db
--- /dev/null
+++ b/plat/mediatek/drivers/spm/rules.mk
@@ -0,0 +1,20 @@
+#
+# Copyright (c) 2023, MediaTek Inc. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+LOCAL_DIR := $(call GET_LOCAL_DIR)
+MODULE := spm
+
+$(eval $(call MAKE_MODULE,$(MODULE),$(LOCAL_SRCS-y),$(MTK_BL)))
+
+ifneq ($(CONFIG_MTK_SPM_VERSION),)
+PLAT_INCLUDES += -I${LOCAL_DIR}/$(MTK_SOC)
+PLAT_INCLUDES += -I${LOCAL_DIR}/version/notifier/inc
+
+SUB_RULES-y += ${LOCAL_DIR}/$(CONFIG_MTK_SPM_VERSION)
+$(eval $(call add_define,SPM_PLAT_IMPL))
+endif
+
+$(eval $(call INCLUDE_MAKEFILE,$(SUB_RULES-y)))