mmc: host: Check timeout status separately during halt

During heavy load on system, sometime driver thread is
schduled out, just after setting timeout period but before
halting cqhci. And when thread gets scheduled, timer is found
expired even though halt is successful, and throws err as halt
failed.

To fix this issue, ignore time_out when halt is successful.

Change-Id: Ifa0dffa386b294962dc711753bbf12a7496ffe23
Signed-off-by: Ram Prakash Gupta <rampraka@codeaurora.org>