fix(fvp): adjust BL31 maximum size as per total SRAM size

Adjusted BL31 maximum size as per total SRAM size.

Change-Id: Ifdfdedb8af3e001cebba8e60c973f3c72be11652
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
(cherry picked from commit 24e224b41cc6fda4b507861cf8e409d8e4a3f7cd)
2 files changed