arm64: fixup for mm renames

__GFP_WAIT was renamed for __GFP_RECLAIM and the gfpflags_allow_blocking()
helper was added.

Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/arm64/mm/dma-mapping.c

@@ -562,7 +562,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size,
  */
  gfp |= __GFP_ZERO;
 
- if (gfp & __GFP_WAIT) {
+ if (gfpflags_allow_blocking(gfp)) {
  struct page **pages;
  pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL, coherent);