Add PWM to the kernel config options that shall be enabled.
When PWM is not enabled connection init will fail with
greybus endo0:3:4:9:9: failed to register PWM: -22
when using the default manifest.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>