mmc: card: Fix packing control enabling algorithm

When hitting a stop potential packing event, we should zero
num_of_potential_packed_wr_reqs, so that the packing won't be
enabled too early.

Change-Id: I1b23f43e00490c086a61c95e640bf71f1e976cf8
Signed-off-by: Maya Erez <merez@codeaurora.org>
1 file changed