ath6kl: Add a bit to ath6kl_dev_state for recovery cleanup state

Add a bit in ath6kl_dev_state to maintian the run time state
of firmware recovery configuration. This would help to have
user configuration in fw_recovery which will be added in
a separate patch.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>