Revert "block: introduce zone_write_granularity limit"

This reverts commit 6b4bb49e which is
commit a805a4fa upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Ib32d4f828dc1ebceb03c73906e7867eaffbdee2f
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>