staging: wfx: merge wfx_stop_ap() with wfx_reset()

wfx_stop_ap() and wfx_reset() do the same thing. Merge them.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200515083325.378539-13-Jerome.Pouiller@silabs.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>