refactor(plat/allwinner): do not map BL32 DRAM at EL3

BL31 does not appear to ever access the DRAM allocated to BL32,
so there is no need to map it at EL3.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Change-Id: Ie8727b793e53ea14517894942266f6da0333eb74
2 files changed