staging: wfx: drop struct wfx_grp_addr_table

The struct wfx_grp_addr_table is only instantiated on one place. There
is no justifiation for this struct. Moreover, it is not consistent with
other fields related to filtering (filter_bssid, etc...).

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200415161147.69738-15-Jerome.Pouiller@silabs.com


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