fix(fvp): increase NS_BL2U limit

Adjust NS_BL2U memory limit from 0x4E000 to 0x50000 to accommodate
growth in the `.bss` section of the xlat tables context module and
prevent overflows when loading the image into DRAM.

Change-Id: I5ddc9368f0eee4c6970a22c5c0389c07d2f2d3d7
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
1 file changed