[COMMON] mm: cma page migration for pinned pages

[COMMON] mm: cma page migration for pinned pages

If the changes in the patch 'cma: redirect page allocation to CMA' were
applied, many user pages could be allocated from cma page block. However,
this can cause migration failures due to pinned pages by __get_user_pages().
This patch adds to support cma page migration at page pinning time if gup_flags
has FOLL_CMA.

Change-Id: I70389f1ddee9697af653c4a50eab161925113979
Signed-off-by: Jinsung Yang <jsgood.yang@samsung.com>
Signed-off-by: Cho KyongHo <pullip.cho@samsung.com>