refactor: moved drivers hdr files to include/drivers/nxp

NXP drivers header files are moved:
  - from:  drivers/nxp/<xx>/*.h
  - to  :  include/drivers/nxp/<xx>/*.h

To accommodate these changes each drivers makefiles
drivers/nxp/<xx>/xx.mk, are updated.

Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com>
Change-Id: I3979c509724d87e3d631a03dbafda1ee5ef07d21
diff --git a/drivers/nxp/drivers.mk b/drivers/nxp/drivers.mk
index c6d5541..c2db363 100644
--- a/drivers/nxp/drivers.mk
+++ b/drivers/nxp/drivers.mk
@@ -1,5 +1,5 @@
 #
-# Copyright 2020 NXP
+# Copyright 2021 NXP
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -8,7 +8,8 @@
 ###############################################################################
 
 
-PLAT_DRIVERS_PATH	:=	drivers/nxp
+PLAT_DRIVERS_PATH		:=	drivers/nxp
+PLAT_DRIVERS_INCLUDE_PATH	:=	include/drivers/nxp
 
 ifeq (${SMMU_NEEDED},yes)
 PLAT_INCLUDES	+= -Iinclude/drivers/nxp/smmu/