staging: wfx: fix error names

ENOTSUP is an alias of EOPNOTSUPP. However, EOPNOTSUPP is preferred.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20210913130203.1903622-20-Jerome.Pouiller@silabs.com


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