wil6210: prevent access to 11AD device if resume fails

In case wil6210 resume fails, wil6210 suspend function will try
to access the suspended device in the next kernel suspend.
To prevent that, add wil_status_suspended flag to indicate if the
device is already suspended and clear it only if the resume succeeds.

Change-Id: I548e5b516cfa62389ce5f6cafcf1568206f7c2a9
Signed-off-by: Maya Erez <merez@codeaurora.org>