platform: msm_shared: Optimize unaligned emmc erase

Unaligned erase is handled by zeroing out the blocks
one by one instead we should use a single write to zero
out all the blocks.

CRs-Fixed: 629782
Change-Id: I7eb4a5f8c77da578a971e8b248bfb0da0e7951d2
1 file changed