qcacld-3.0: Flush the bandwidth work properly in shutdown

In case interface timer has expired and modules have been stopped
and there is an SSR the bus bandwidth work is not properly destroyed.

Destroy the work before checking for status of modules state since
the work will be re-initialized.

Change-Id: Ie3b8f7d6d0fe1261f9f3c412e933748fb7637ca7
CRs-Fixed: 2573341
2 files changed