armv8: ls1046ardb: Add LS1046ARDB board support

LS1046ARDB Specification:
-------------------------
Memory subsystem:
 * 8GByte DDR4 SDRAM (64bit bus)
 * 512 Mbyte NAND flash
 * Two 64 Mbyte high-speed SPI flash
 * SD connector to interface with the SD memory card
 * On-board 4G eMMC

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

PCIe:
 * PCIe1 (SerDes2 Lane0) to miniPCIe slot
 * PCIe2 (SerDes2 Lane1) to x2 PCIe slot
 * PCIe3 (SerDes2 Lane2) to x4 PCIe slot

SATA:
 * SerDes2 Lane3 to SATA port

USB 3.0: one super speed USB 3.0 type A port
	 one Micro-AB port

UART: supports two UARTs up to 115200 bps for console

Signed-off-by: Mingkai Hu <mingkai.hu@nxp.com>
Signed-off-by: Shaohui Xie <Shaohui.Xie@nxp.com>
Signed-off-by: Gong Qianyu <Qianyu.Gong@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/ls1046ardb/README b/board/freescale/ls1046ardb/README
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+Overview
+--------
+The LS1046A Reference Design Board (RDB) is a high-performance computing,
+evaluation, and development platform that supports the QorIQ LS1046A
+LayerScape Architecture processor. The LS1046ARDB provides SW development
+platform for the Freescale LS1046A processor series, with a complete
+debugging environment. The LS1046A RDB is lead-free and RoHS-compliant.
+
+LS1046A SoC Overview
+--------------------
+Please refer arch/arm/cpu/armv8/fsl-layerscape/doc/README.soc for LS1046A
+SoC overview.
+
+ LS1046ARDB board Overview
+ -----------------------
+ - SERDES1 Connections, 4 lanes supporting:
+      - Lane0: XFI with x1 RJ45 connector
+      - Lane1: XFI Cage
+      - Lane2: SGMII.5
+      - Lane3: SGMII.6
+ - SERDES2 Connections, 4 lanes supporting:
+      - Lane0: PCIe1 with miniPCIe slot
+      - Lane1: PCIe2 with PCIe x2 slot
+      - Lane2: PCIe3 with PCIe x4 slot
+      - Lane3: SATA
+ - DDR Controller
+     - 8GB 64bits DDR4 SDRAM. Support rates of up to 2133MT/s
+ -IFC/Local Bus
+    - One 512 MB NAND flash with ECC support
+    - CPLD connection
+ - USB 3.0
+    - one Type A port, one Micro-AB port
+ - SDHC: connects directly to a full SD/MMC slot
+ - DSPI: 64 MB high-speed flash Memory for boot code and storage (up to 108MHz)
+ - 4 I2C controllers
+ - UART
+   - Two 4-pin serial ports at up to 115.2 Kbit/s
+   - Two DB9 D-Type connectors supporting one Serial port each
+ - ARM JTAG support
+
+Memory map from core's view
+----------------------------
+Start Address	 End Address	 Description		Size
+0x00_0000_0000 - 0x00_000F_FFFF  Secure Boot ROM	1MB
+0x00_0100_0000 - 0x00_0FFF_FFFF  CCSRBAR		240MB
+0x00_1000_0000 - 0x00_1000_FFFF  OCRAM0 		64KB
+0x00_1001_0000 - 0x00_1001_FFFF  OCRAM1 		64KB
+0x00_2000_0000 - 0x00_20FF_FFFF  DCSR			16MB
+0x00_7E80_0000 - 0x00_7E80_FFFF  IFC - NAND Flash	64KB
+0x00_7FB0_0000 - 0x00_7FB0_0FFF  IFC - CPLD		4KB
+0x00_8000_0000 - 0x00_FFFF_FFFF  DRAM1			2GB
+0x05_0000_0000 - 0x05_07FF_FFFF  QMAN S/W Portal	128M
+0x05_0800_0000 - 0x05_0FFF_FFFF  BMAN S/W Portal	128M
+0x08_8000_0000 - 0x09_FFFF_FFFF  DRAM2			6GB
+0x40_0000_0000 - 0x47_FFFF_FFFF  PCI Express1		32G
+0x48_0000_0000 - 0x4F_FFFF_FFFF  PCI Express2		32G
+0x50_0000_0000 - 0x57_FFFF_FFFF  PCI Express3		32G
+
+QSPI flash map:
+Start Address    End Address     Description		Size
+0x00_4000_0000 - 0x00_400F_FFFF  RCW + PBI		1MB
+0x00_4010_0000 - 0x00_401F_FFFF  U-Boot 		1MB
+0x00_4020_0000 - 0x00_402F_FFFF  U-Boot Env		1MB
+0x00_4030_0000 - 0x00_403F_FFFF  FMan ucode		1MB
+0x00_4040_0000 - 0x00_404F_FFFF  UEFI			1MB
+0x00_4050_0000 - 0x00_406F_FFFF  PPA			2MB
+0x00_4070_0000 - 0x00_408F_FFFF  Secure boot header
+			         + bootscript		2MB
+0x00_4090_0000 - 0x00_40FF_FFFF  Reserved		7MB
+0x00_4100_0000 - 0x00_43FF_FFFF  FIT Image		48MB
+
+Booting Options
+---------------
+a) QSPI boot
+b) SD boot
+c) eMMC boot