add u-boot specific dtsi file for socrates board.
Signed-off-by: Heiko Schocher Reviewed-by: Priyanka Jain
SOCRATES BOARD M: Heiko Schocher <hs@denx.de> S: Maintained F: board/socrates/ F: include/configs/socrates.h F: configs/socrates_defconfig F: arch/powerpc/dts/socrates.dts F: arch/powerpc/dts/socrates-u-boot.dtsi
