mm: kmemleak: add OBJECT_PHYS flag for objects allocated with physical address

Add OBJECT_PHYS flag for object.  This flag is used to identify the
objects allocated with physical address.  The create_object_phys()
function is added as well to set that flag and is used by
kmemleak_alloc_phys().

Link: https://lkml.kernel.org/r/20220611035551.1823303-3-patrick.wang.shcn@gmail.com


Signed-off-by: Patrick Wang <patrick.wang.shcn@gmail.com>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Yee Lee <yee.lee@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>