bluetooth: wait for during suspend URBs to finish on disconnect

URBs submitted during suspend are placed on deferred anchor and
scuttled on resume before submission. If disconnect/module unload
is called after resume, the callback function of such URBs can lead
to a page fault. Place such URBs on tx_anchor on resume.

clear HCI_RUNNING bit in disconnect so that no new URBs can be
submitted.

Change-Id: I2714ae397d96c73f80644159202dedda60fe0809
Signed-off-by: Rupesh Tatiya <rtatiya@codeaurora.org>