armv8: ls1088ardb: Add support for LS1088ARDB platform

LS1088A is an ARMv8 implementation. The LS1088ARDB is an evaluatoin
platform that supports the LS1088A family SoCs. This patch add basic
support of the platform.

Signed-off-by: Alison Wang <alison.wang@nxp.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
Signed-off-by: Ashish Kumar <Ashish.Kumar@nxp.com>
Signed-off-by: Raghav Dogra <raghav.dogra@nxp.com>
Signed-off-by: Shaohui Xie <Shaohui.Xie@nxp.com>
[YS: Disabled NAND in board header file]
Reviewed-by: York Sun <york.sun@nxp.com>

WIP: disable NAND for LS1088ARDB
diff --git a/board/freescale/ls1088a/README b/board/freescale/ls1088a/README
new file mode 100644
index 0000000..3f4d987
--- /dev/null
+++ b/board/freescale/ls1088a/README
@@ -0,0 +1,66 @@
+Overview
+--------
+The LS1088A Reference Design (RDB) is a high-performance computing,
+evaluation, and development platform that supports ARM SoC LS1088A and its
+derivatives.
+
+
+LS1088A SoC Overview
+--------------------------------------
+Please refer arch/arm/cpu/armv8/fsl-layerscape/doc/README.soc
+
+RDB Default Switch Settings (1: ON; 0: OFF)
+-------------------------------------------
+
+For QSPI Boot
+SW1 0011 0001
+SW2 x100 0000
+SW3 1111 0010
+SW4 1001 0011
+SW5 1111 0000
+
+For SD Boot
+SW1 0010 0000
+SW2 0100 0000
+SW3 1111 0010
+SW4 1001 0011
+SW5 1111 0000
+
+For eMMC Boot
+SW1 0010 0000
+SW2 1100 0000
+SW3 1111 0010
+SW4 1001 0011
+SW5 1111 0000
+
+Alternately you can use this command to switch from QSPI to SD
+
+=> i2c mw 66 0x60 0x20; i2c mw 66 10 10;i2c mw 66 10 21
+
+ LS1088ARDB board Overview
+ -------------------------
+ - SERDES Connections, 16 lanes supporting:
+      - PCI Express - 3.0
+      - SATA 3.0
+      - XFI
+      - QSGMII
+ - DDR Controller
+     - One ports of 72-bits (8-bits ECC, 64-bits DATA) DDR4. Each port supports four
+       chip-selects on one DIMM connector. Support is up to 2133MT/s, Although MAX default
+       with FSL refernce software is 2100MT/s
+ - 2 QSPI-NOR Spansion(S25FS512SDSMFI011) flash of size 64MB
+ - IFC/Local Bus
+    - One 2 GB NAND flash with ECC support, not as boot source
+    - CPLD of size 2K
+ - USB 3.0
+    - Two high speed USB 3.0 ports
+    - First USB 3.0 port configured as Host with Type-A connector
+    - Second USB 3.0 port configured as OTG with micro-AB connector
+ - SDHC/eMMC
+    - SDHC slot and onboard eMMC are muxed together
+ - 4 I2C controllers
+ - Two SATA onboard connectors
+ - 2 UART
+ - JTAG support
+ - QSPI emulator support
+ - TDM riser support