armv8: ls1046aqds: Add LS1046AQDS board support

LS1046AQDS Specification:
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Memory subsystem:
 * 8GByte DDR4 SDRAM (64bit bus)
 * 128 Mbyte NOR flash single-chip memory
 * 512 Mbyte NAND flash
 * 64 Mbyte high-speed SPI flash
 * SD connector to interface with the SD memory card

Ethernet:
 * Two XFI 10G ports
 * Two SGMII ports
 * Two RGMII ports

PCIe: supports Gen 1 and Gen 2

SATA 3.0: one SATA 3.0 port

USB 3.0: two micro AB connector and one type A connector

UART: supports two UARTs up to 115200 bps for console

Signed-off-by: Shaohui Xie <Shaohui.Xie@nxp.com>
Signed-off-by: Mingkai Hu <mingkai.hu@nxp.com>
Signed-off-by: Gong Qianyu <Qianyu.Gong@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>