netlink: specs: ethtool: mark pads as pads

Pad is a separate type. Even though in practice they can
only be a u32 the value should be discarded.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/netlink/specs/ethtool.yaml

@@ -502,7 +502,7 @@ attribute-sets:
     attributes:
       -
         name: pad
-        type: u32
+        type: pad
       -
         name: tx-frames
         type: u64
@@ -720,7 +720,7 @@ attribute-sets:
     attributes:
       -
         name: pad
-        type: u8
+        type: pad
       -
         name: corrected
         type: binary
@@ -784,7 +784,7 @@ attribute-sets:
     attributes:
       -
         name: pad
-        type: u32
+        type: pad
       -
         name: id
         type: u32
@@ -830,7 +830,7 @@ attribute-sets:
     attributes:
       -
         name: pad
-        type: u32
+        type: pad
       -
         name: header
         type: nest