staging: wfx: enable powersave on probe

In the old days, ieee80211 powersave has some impact on the Rx speed.
These problems are solved for a long time now. There is no more reason
to not enabling it.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200825085828.399505-10-Jerome.Pouiller@silabs.com


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