staging: wfx: apply 80-columns rule to strings

Strings are allowed to exceed 80 columns but, in this case, the format
arguments should be placed on a new line. Apply this rule to the whole
code of the driver.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200515083325.378539-3-Jerome.Pouiller@silabs.com


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