staging: wfx: fix spaces

There is no reason to place two spaces between the field tx_conf_payload
and its type.

In the same vein, remove duplicate empty lines between declarations.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200907101521.66082-29-Jerome.Pouiller@silabs.com


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