refactor(plat/arm): mark the flash region as read-only

In the FVP platform, BL1 uses flash only for read purpose
hence marked this flash region as read-only.

Change-Id: I3b57130fd4f3b4df522ac075f66e9799f237ebb7
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
1 file changed