Add hnvram for grabbing env variables during boot

cmd_hnvram.c modifed from uboot/armada

hnvram must be loaded into dram during boot since the uboot heap
uses sram, which is too small. Currently hnvram is stored at
0x87800000 or 120-122 of dram's 128 MB.

Change-Id: I24a6f8ebed08beb3b1026c9765143a1b9d3400d8
5 files changed