mmc: cmdq: Set the timeout before unhalt

After halting CQE, if other commands are sent in legacy mode,
the timeout would be modified as per the requirements of the
command. Upon unhalting, this timeout would still persist for
CQE too, which in some cases may lead to timeout.

Hence, change the timeout to 0xf i.e. max during unhalt.

Change-Id: Ifb0a1f4b9508c5884d381401216ae6c1373bb7de
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>