ARM: dts: am335x-shc: add u-boot specific dtsi

add u-boot specific am335x-shc-u-boot.dtsi file,
in which we add u-boot specific adaptions.

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/bosch/shc/MAINTAINERS b/board/bosch/shc/MAINTAINERS
index 1ed98bc..137e647 100644
--- a/board/bosch/shc/MAINTAINERS
+++ b/board/bosch/shc/MAINTAINERS
@@ -10,3 +10,4 @@
 F:	configs/am335x_shc_sdboot_defconfig
 F:	configs/am335x_shc_sdboot_prompt_defconfig
 F:	arch/arm/dts/am335x-shc.dts
+F:	arch/arm/dts/am335x-shc-u-boot.dtsi