staging: wfx: align semantic of beacon filter with other filters

Filters provided by HIF API are sometime inclusive, sometime exclusive.

This patch align the behavior and name of the beacon filter with the
other filters. Also avoid double negation: "disable filter"

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200415161147.69738-13-Jerome.Pouiller@silabs.com


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