refactor(arm): update BL2 base address

BL2 base address updated to provide enough space for BL31 in
Trusted SRAM when building with BL2_AT_EL3 and ENABLE_PIE options.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: Ieaba00d841648add855feb99b7923a4b0cccfb08
1 file changed