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 <marek.vasut+renesas@gmail.com>
Change-Id: I11d882f30ca4f0cf55fd28d3470ff1063d350d10
1 file changed