netlink: specs: Expand the pse netlink command with PoE interface

Add the PoE pse attributes prefix to be able to use PoE interface.

Example usage:
./ynl/cli.py --spec netlink/specs/ethtool.yaml --no-schema --do pse-get \
--json '{"header":{"dev-name":"eth0"}}'
{'header': {'dev-index': 4, 'dev-name': 'eth0'},
'c33-pse-admin-state': 3,
'c33-pse-pw-d-status': 4}

./ynl/cli.py --spec netlink/specs/ethtool.yaml --no-schema --do pse-set \
--json '{"header":{"dev-name":"eth0"},
"c33-pse-admin-control":3}'

Reviewed-by: Andrew Lunn <[e-mail]>
Signed-off-by: Kory Maincent <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

Documentation/netlink/specs/ethtool.yaml

···
         name: podl-pse-pw-d-status
         type: u32
         name-prefix: ethtool-a-
+      -
+        name: c33-pse-admin-state
+        type: u32
+        name-prefix: ethtool-a-
+      -
+        name: c33-pse-admin-control
+        type: u32
+        name-prefix: ethtool-a-
+      -
+        name: c33-pse-pw-d-status
+        type: u32
+        name-prefix: ethtool-a-
   -
     name: rss
     attributes:
···
             - podl-pse-admin-state
             - podl-pse-admin-control
             - podl-pse-pw-d-status
+            - c33-pse-admin-state
+            - c33-pse-admin-control
+            - c33-pse-pw-d-status
       dump: *pse-get-op
     -
       name: pse-set