netlink-specs: add rx-push to ethtool family

Commit 5b4e9a7a ("net: ethtool: extend ringparam set/get APIs for rx_push")
added a new attr for configuring rx-push, right after tx-push.
Add it to the spec, the ring param operation is covered by
the otherwise sparse ethtool spec.
Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Link: https://lore.kernel.org/r/20230214043246.230518-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/netlink/specs/ethtool.yaml

@@ -171,6 +171,9 @@ attribute-sets:
       -
         name: tx-push
         type: u8
+      -
+        name: rx-push
+        type: u8
 
   -
     name: mm-stat
@@ -320,6 +323,7 @@ operations:
             - tcp-data-split
             - cqe-size
             - tx-push
+            - rx-push
       dump: *ring-get-op
     -
       name: rings-set
@@ -339,6 +343,7 @@ operations:
             - tcp-data-split
             - cqe-size
             - tx-push
+            - rx-push
     -
       name: rings-ntf
       doc: Notification for change in ring params.