wcn36xx: add debug_mask module parameter

With debug_mask module parameter it's easier to
control debug messages.

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
wcn36xx: add debug_mask to wcn36xx_dbg_dump()

Uses the same debug mask values as wcn36xx_dbg()

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Merge pull request #14 from kvalo/wcn36xx-debug-levels-1

Add debug_mask module parameter and debug levels