doc: netlink: specs: tc: flower: add enc-flags

Describe key-enc-flags and key-enc-flags-mask.

These are defined similarly to key-flags and key-flags-mask.
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://patch.msgid.link/20240713021911.1631517-11-ast@fiberby.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/netlink/specs/tc.yaml

@@ -2763,6 +2763,18 @@ attribute-sets:
         name: key-spi-mask
         type: u32
         byte-order: big-endian
+      -
+        name: key-enc-flags
+        type: u32
+        byte-order: big-endian
+        enum: tc-flower-key-ctrl-flags
+        enum-as-flags: true
+      -
+        name: key-enc-flags-mask
+        type: u32
+        byte-order: big-endian
+        enum: tc-flower-key-ctrl-flags
+        enum-as-flags: true
   -
     name: tc-flower-key-enc-opts-attrs
     attributes: