refactor(qemu): move FDT stuff into one place

Move libfdt includes into common file and use definitions from them.

Change-Id: Ic4fe784fdbedcf5e9e3804a633fcac68464f38a6
Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
diff --git a/plat/qemu/qemu_sbsa/platform.mk b/plat/qemu/qemu_sbsa/platform.mk
index 3dfefd0..1b4dc05 100644
--- a/plat/qemu/qemu_sbsa/platform.mk
+++ b/plat/qemu/qemu_sbsa/platform.mk
@@ -4,12 +4,10 @@
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
-include common/fdt_wrappers.mk
+include plat/qemu/common/common.mk
 
 CRASH_REPORTING	:=	1
 
-include lib/libfdt/libfdt.mk
-
 ifeq (${SPM_MM},1)
 NEED_BL32		:=	yes
 EL3_EXCEPTION_HANDLING	:=	1