ARM: dts: add SolidRun SolidSense support

Add support for the SolidRun SolidSense platform, which is a
Hummingboard2 with a daughter card with two Nordic software defined
radios and a couple of bi-color LEDs.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>