fix(coverity): increase TSRAM for RESET_TO_BL2

This configuration requires a larger Trusted SRAM than 256KB to build,
hence adding an additional 128KB.

Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
Change-Id: I2a2ac3adb08dd6df6d4c8a3d2d28bda0949f713e
1 file changed