arm64: dts: add LS1046A-QDS board support

The LS1046A QorIQ development system (QDS) board is a high-performance
computing, evaluation, development, and test platform supporting the
LS1046A SoC.

Signed-off-by: Shaohui Xie <Shaohui.Xie@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>