rcar_gen3: plat: Set M3W ULCB DRAM size to 2 GiB
rcar_gen3: plat: Set M3W ULCB DRAM size to 2 GiB

The M3W ULCB board has 2 GiB of DRAM, set it so.

Signed-off-by: Marek Vasut <bcf2901fa1b128a7a3f88ee031c46807a29aa29d@gmail.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware