staging: wfx: drop useless attribute 'bss_params'

Since wfx_bss_params_work() does not exist anymore, there is no more
reason to keep a copy of bss_params in struct wfx_dev. A local instance
in wfx_join_finalize() is sufficient.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200420160311.57323-4-Jerome.Pouiller@silabs.com


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