ARM: socfpga: dts: convert to preprocessor includes

Convert all socfpga DT files to the dtc preprocessor include syntax.
This allows to include header files in the devicetrees like other
SoC-types already do.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Dinh Nguyen <dinguyen@altera.com>

diff --cc arch/arm/boot/dts/socfpga.dtsi
Simple merge

diff --cc arch/arm/boot/dts/socfpga_arria5.dtsi
Simple merge

diff --cc arch/arm/boot/dts/socfpga_arria5_socdk.dts
Simple merge

diff --cc arch/arm/boot/dts/socfpga_cyclone5.dtsi
Simple merge

diff --cc arch/arm/boot/dts/socfpga_cyclone5_socdk.dts
Simple merge

diff --cc arch/arm/boot/dts/socfpga_cyclone5_sockit.dts
Simple merge

diff --cc arch/arm/boot/dts/socfpga_cyclone5_socrates.dts
Simple merge

diff --cc arch/arm/boot/dts/socfpga_vt.dts
Simple merge