ARM: hisilicon: hikey: Align memory node with upstream kernel

ARM: hisilicon: hikey: Align memory node with upstream kernel

The memory node gets automatically generated by U-Boot
in arch_fixup_fdt(), before passing control to the kernel
using U-Boots representation of the dram banks.

However the upstream kernel uses the memory node to carve-out
regions of RAM for various purposes. To make this work without
changing arch_fixup_fdt() which will effect many platforms
we replicate the upstream memory node layout using the dram
banks.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Tom Rini <trini@konsulko.com>