msm: Select ENABLE_HOLES_IN_ZONE

Current configurations end up with holes in the middle of
the highmem zone. The vm system makes certain assumptions
about the lack of holes within a zone. Failure to account
for these holes can lead to crashes due to accessing
uninitialized page structures. Select ENABLE_HOLES_IN_ZONE
to ensure these holes are properly accounted for.

Change-Id: I09afb2dc2a6903ae6064aea2d36610b530bbd7c3
CRs-Fixed: 348170
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>