ath9k: Take the samples in unassociated state

Currently the samples debugfs which maintains the snapshorts of
mac/bb only on associated state. Hence to cover issues on idle
state, the samples are taken whenever the driver is ready.

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>