feat(mediatek): move dp drivers to common folder

Display port driver can be reused, so we move it to common/drivers.

TEST=build mt8195 pass
BUG=b:233720142

Change-Id: I58c7b41ba3ad653cdf6f6fbae6778abfd7e950a9
diff --git a/plat/mediatek/drivers/dp/rules.mk b/plat/mediatek/drivers/dp/rules.mk
new file mode 100644
index 0000000..786d514
--- /dev/null
+++ b/plat/mediatek/drivers/dp/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 := dp
+LOCAL_SRCS-y := $(LOCAL_DIR)/mt_dp.c
+
+PLAT_INCLUDES += -I${LOCAL_DIR}
+
+$(eval $(call MAKE_MODULE,$(MODULE),$(LOCAL_SRCS-y),$(MTK_BL)))