rockchip: add an fdt parsing stub for platform param

The Rockchip ATF platform can be entered from both Coreboot and U-Boot.
While Coreboot does submit the list of linked parameter structs as
platform param, upstream u-boot actually always provides a pointer
to a devicetree as parameter.
This results in current ATF not running at all when started from U-Boot.

To fix this, add a stub that checks if the parameter is a fdt so we
can at least boot and not get stuck. Later on we can extend this with
actual parsing of information from the devicetree.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/plat/rockchip/rk3328/platform.mk b/plat/rockchip/rk3328/platform.mk
index ca6345b..18b1b94 100644
--- a/plat/rockchip/rk3328/platform.mk
+++ b/plat/rockchip/rk3328/platform.mk
@@ -8,6 +8,8 @@
 RK_PLAT_SOC		:=	${RK_PLAT}/${PLAT}
 RK_PLAT_COMMON		:=	${RK_PLAT}/common
 
+include lib/libfdt/libfdt.mk
+
 PLAT_INCLUDES		:=	-Idrivers/arm/gic/common/			\
 				-Idrivers/arm/gic/v2/			\
 				-I${RK_PLAT_COMMON}/                            \
@@ -38,6 +40,7 @@
 				drivers/delay_timer/generic_delay_timer.c	\
 				lib/cpus/aarch64/aem_generic.S			\
 				lib/cpus/aarch64/cortex_a53.S			\
+				$(LIBFDT_SRCS)					\
 				${RK_PLAT_COMMON}/drivers/parameter/ddr_parameter.c	\
 				${RK_PLAT_COMMON}/aarch64/plat_helpers.S	\
 				${RK_PLAT_COMMON}/bl31_plat_setup.c		\