arm64: Create link to include/dt-bindings to enable C preprocessor use.

DT files used in the compilation phase can be preprocessed by the C
preprocessor. This requires an include/dt-bindings directory to be
present in the arch/arm64/boot/dts directory.

Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm64/boot/dts/include/dt-bindings

@@ -0,0 +1 @@
+../../../../../include/dt-bindings