feat(ls1046afrwy): add ls1046afrwy board support

The LS1046A Freeway board (FRWY) is a high-performance computing,
evaluation, and development platform that supports the LS1046A
architecture processor capable of support more than 32,000 CoreMark
performance. The FRWY-LS1046A board supports the LS1046A processor,
onboard DDR4 memory, multiple Gigabit Ethernet, USB3.0 and M2_Type_E
interfaces for Wi-Fi, FRWY-LS1046A-AC includes the Wi-Fi card.

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: I9a9680689e6f17bf4cc76fd5d1883eed6ace5149