fix(ufs): don't zero out buf before ufs read

ufs_read_blocks always zeros out the buffer before passing
to UFS for DMA. We don't need to zero out buf before reading
from UFS storage, this change remove the memset in ufs_read_blocks.

Signed-off-by: Channa Kadabi <kadabi@google.com>
Change-Id: I8029a7ea07fbd8cce29b383c80a3cfc782c5b7ec
1 file changed