feat(drivers/rcar3): add extra offset if booting B-side
feat(drivers/rcar3): add extra offset if booting B-side

In case MFISBTSTSR bit 4 is 1, that means the loader was started as
B-side. Load the remaining boot components from 8 MiB offset.

Signed-off-by: Marek Vasut <bcf2901fa1b128a7a3f88ee031c46807a29aa29d@gmail.com>
Change-Id: I11d882f30ca4f0cf55fd28d3470ff1063d350d10

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