wil6210: fix wil->platform_ops.suspend failure handling

Current handling of wil->platform_ops.suspend can lead to
bad cases, as wil_status_suspending was cleared before
wil_status_resuming was set and bus request voting was restored
too late.
In addition, bus voting in suspend should be done only at the end
of he suspend flow.

Change-Id: I8856d393c1796a2bd8fd5e07b233a5d61efc80c0
Signed-off-by: Maya Erez <merez@codeaurora.org>