ARM: dts: tq imx7s board support

This adds support for the TQ TQMa7S SoM together with
the MBa7 carrier board and it's based on the NXP i.MX7Solo SoC.

Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>