mmc: Allow periodic BKOPS on different sizes of devices

Remove the need to check the number of written or discarded sectors
as a trigger for checking the BKOPS status.
Move the call to mmc_stop_bkops to mmc/block in order to prevent the
need to claim the host again for this operation (which can cause
degradation in case of random operations)

Change-Id: I9986387bc6c7e89ddfed603dbf8fce7607537c5b
Signed-off-by: Maya Erez <merez@codeaurora.org>
6 files changed