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>
3 files changed