fix(build): allow lower address access with gcc-12

With gcc-12 any lower address access can trigger a warning/error
this would be useful in other parts of system but in TFTF
there are various reasons to access to the lower address ranges for
tests, example using mmio_read_*/writes_*

So setup to allow access to lower addresses while using gcc-12

Change-Id: I3153fd4545e79d14151249fcb5a395c9e61a771a
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
2 files changed