feat(mt8188): add reset and poweroff functions

- Add mtk_pm_system_reset_cros() for cros reset.
- Add mtk_pm_system_off_cros() for cros power-off.

TEST=build pass
BUG=b:236331724

Change-Id: I4117f6080e282551b37a936a490ab7b37ac31827
diff --git a/plat/mediatek/lib/system_reset/rules.mk b/plat/mediatek/lib/system_reset/rules.mk
new file mode 100644
index 0000000..4f20663
--- /dev/null
+++ b/plat/mediatek/lib/system_reset/rules.mk
@@ -0,0 +1,14 @@
+#
+# Copyright (c) 2022, MediaTek Inc. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#
+
+LOCAL_DIR := $(call GET_LOCAL_DIR)
+
+MODULE := system_reset
+
+LOCAL_SRCS-y := ${LOCAL_DIR}/reset_cros.c
+
+$(eval $(call MAKE_MODULE,$(MODULE),$(LOCAL_SRCS-y),$(MTK_BL)))