ANDROID: vendor_hooks: Add hooks for adjusting alloc_flags

the reason why we add a vendor hook adjusting alloc_flags:
1 the user only pass parameter size and gfp_flags once. if we mask the __GFP_RECLAIM, we can't distinguish high-order and low-order, they all will not rise reclaim behavior, it's wrong.

2 for __iommu_dma_alloc_pages, there is a loop to try to alloc pages from high-order to low-order fallback, and we add hook callsite to only change the high-order( > costly order) alloc behavior(which high probability will result more overhead than benifit).
which allow low order alloc to do reclaim behavior still, otherwise may end up with alloc fail.

3 in android ION(drivers/dma-buf/heaps/system_heap.c )
there is same logic, high-order alloc will not do reclaim behavior.

so this change and a vendor hook for adjusting alloc_flags, and add a callsite in __iommu_dma_alloc_pages to turn the reclaim behavior.

Bug: 300857012
Bug: 306323459
Change-Id: I30bd634d8ede1cc29c83d52bdd9276c8cf72ac1e
Signed-off-by: lvwenhuan <lvwenhuan@oppo.com>
(cherry picked from commit d6c24c3a)
(cherry picked from commit 0b200357)