wil6210: add oob_mode for AP certification

Add a new value to the oob_mode module parameter for
supporting AP certification.
All enabled values of oob_mode (>0) are intended only
for debugging and diagnostics.

Signed-off-by: Lior David <qca_liord@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>