refactor(fvp): increase bl2 size when bl31 in DRAM

Increase the space for BL2 by 0xC000 to accommodate the increase in size
of BL2 when ARM_BL31_IN_DRAM is set.

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: Ifc99da51f2de3c152bbed1c8269dcc8b9100797a
1 file changed