smd: add debug message for hal start command

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
smd: use hal stop command

Now, at least on mako, you can freely put interface up and down and everything
will still work. Also you can remove and insert wcn36xx.ko freely.

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