staging: wfx: fix alignements of function prototypes

Some function prototypes were not correctly aligned and/or exceed 80
columns.

In some other cases, the prototypes were written on more lines than
necessary.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200505123757.39506-14-Jerome.Pouiller@silabs.com


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