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This commit fixes an assertion that was triggering in certain contexts:

    ERROR: mmap_add_region_check() failed. error -22
    ASSERT: lib/xlat_tables_v2/xlat_tables_core.c:790

Change-Id: Ia55b3fb4f496c8cd791ea6093d122edae0a7e92a
Signed-off-by: Chris Kay <chris.kay@arm.com>
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>