ANDROID: zram: allow zram to allocate CMA pages

Though zram pages are movable, they aren't allowed to enter
MIGRATE_CMA pageblocks. zram is not seen to pin pages for
long which can cause an issue. Moreover allowing zram to
pick CMA pages can be helpful in cases seen where zram order
0 alloc fails when there are lots of free cma pages, resulting
in kswapd or direct reclaim not making enough progress.

Bug: 330201547
Change-Id: I31f4a21781cdb31982a768daa59e9546d7667b08
Link: https://lore.kernel.org/linux-mm/4c77bb100706b714213ff840d827a48e40ac9177.1604282969.git.cgoldswo@codeaurora.org/


Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
Signed-off-by: Chris Goldsworthy <cgoldswo@codeaurora.org>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
[isaacm@codeaurora.org: Resolve trivial merge conflicts]
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
Signed-off-by: Sukadev Bhattiprolu <quic_sukadev@quicinc.com>