dpll: spec: Add Netlink spec in YAML

Add a protocol spec for DPLL.
Add code generated from the spec.

Signed-off-by: Jakub Kicinski <[email protected]>
Signed-off-by: Michal Michalik <[email protected]>
Signed-off-by: Vadim Fedorenko <[email protected]>
Signed-off-by: Arkadiusz Kubalewski <[email protected]>
Signed-off-by: Jiri Pirko <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Vadim Fedorenko