rtw88: wow: print key type when failing

It's much easier to spot what went wrong when you print out the
unhandled key type.

Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201112181432.2958021-1-briannorris@chromium.org