arm: dts: add am335x-shc.dts for shc board

add DTS from linux tree commit
"47bfa6d9dc8c060bf56554a465c9031e286d2f80"

change for U-Boot:
switch to SPDX-license identifier.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 46f1d69..d4eae02 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -194,6 +194,7 @@
 	am335x-icev2.dtb \
 	am335x-pxm50.dtb \
 	am335x-rut.dtb \
+	am335x-shc.dtb \
 	am335x-pdu001.dtb \
 	am335x-chiliboard.dtb \
 	am335x-sl50.dtb \