ANDROID: mm/readahead: add for bypass high order allocation

EROFS supports large folios on kernel-6.12 which enable high order
allocation with direct_reclaim flags. This might increase the latency
on UX task with filemap_fault(). Add a vendor hook here to bypass
unnecessary allocation in certain scenarios.

Bug: 430753566
Bug: 434600944
Change-Id: I0f11b059a06d1e839aed51dc9b41f1a312eec048
Signed-off-by: Hailong Liu <hailong.liu@oppo.com>
(cherry picked from commit 6222007a)