feat(ls1046ardb): add ls1046ardb board support

The LS1046A reference design board (RDB) is a high-performance
computing, evaluation, and development platform that supports
the Layerscape LS1046A architecture processor.

Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>
Signed-off-by: York Sun <york.sun@nxp.com>
Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com>
Change-Id: Ib7a01b309e0b0acc7f38e22b138e9e181dff244a
6 files changed