aries | p1: mm: remove ZAP_BLOCK_SIZE

ZAP_BLOCK_SIZE became unused in the preemptible-mmu_gather work ("mm:
Remove i_mmap_lock lockbreak").  So zap it.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Change-Id: Iaa914013e850417d4d9d13740c333680e0a88357
Merge "aries | p1: mm: remove ZAP_BLOCK_SIZE" into android-4.4