staging: wfx: fix Makefile and Kconfig licenses

License was missing in Kconfig.

Makefile license was GPL-2.0 while rest of the driver use GPL-2.0-only.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20220113085524.1110708-2-Jerome.Pouiller@silabs.com


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