drivers: kscan: fix NOTSUP vs NOSYS usage

Return -ENOSYS when implementation is missing and -ENOTSUP if the
feature is not supported. Those are 2 things. Missing implementation
(-ENOSYS) means that the driver is lacking support for the feature,
-ENOTSUP means we have an implementation but some parameters or
conditions makes the request unsupported.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
1 file changed