staging: wfx: remove force_ps_timeout

ps_timeout should be in nl80211, not in debugfs. Let's remove it until
the driver is accepted.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20220113085524.1110708-27-Jerome.Pouiller@silabs.com


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