imx8mq/imx8mm: make sure no overlap during memory map

The debug version of TF-A has below assert, fix
it by making sure no memory map overlap.

ASSERT: lib/xlat_tables/xlat_tables_common.c:129

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
(cherry picked from commit a8950cc0c6e08bd399d492c5925f0d9464369ccd)
2 files changed