refactor(mediatek): change LPM header file path for further extension

Move `mt_lp_rm.h` to `plat/mediatek/include/lpm` for further extension.

Change-Id: If377ce6791ce80f82643b0f2466eb0f1aa5aa40b
Signed-off-by: Liju-Clr Chen <liju-clr.chen@mediatek.com>
diff --git a/plat/mediatek/mt8195/platform.mk b/plat/mediatek/mt8195/platform.mk
index 07d39cb..48dafa3 100644
--- a/plat/mediatek/mt8195/platform.mk
+++ b/plat/mediatek/mt8195/platform.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2021-2022, MediaTek Inc. All rights reserved.
+# Copyright (c) 2021-2023, MediaTek Inc. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -8,7 +8,6 @@
 MTK_PLAT_SOC := ${MTK_PLAT}/${PLAT}
 
 PLAT_INCLUDES := -I${MTK_PLAT}/common/                            \
-                 -I${MTK_PLAT}/common/lpm/                        \
                  -I${MTK_PLAT}/drivers/cirq/                      \
                  -I${MTK_PLAT}/drivers/dp/                        \
                  -I${MTK_PLAT}/drivers/gic600/                    \
@@ -20,6 +19,7 @@
                  -I${MTK_PLAT}/drivers/timer/                     \
                  -I${MTK_PLAT}/drivers/uart/                      \
                  -I${MTK_PLAT}/include/                           \
+                 -I${MTK_PLAT}/include/lpm/                       \
                  -I${MTK_PLAT_SOC}/drivers/apusys/                \
                  -I${MTK_PLAT_SOC}/drivers/dcm                    \
                  -I${MTK_PLAT_SOC}/drivers/dfd                    \