feat(sgi): bump bl1 rw size

Increase BL1 RW size by 16 KiB to accommodate for future development.

Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
Change-Id: I21626a97de4a6c98c25b93b9f79e16325c6e4349
1 file changed