netlink: specs: rt-addr: add C naming info

Add properties needed for C codegen to match names with uAPI headers.

Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://patch.msgid.link/20250410014658.782120-6-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/netlink/specs/rt-addr.yaml

@@ -2,6 +2,7 @@
 
 name: rt-addr
 protocol: netlink-raw
+uapi-header: linux/rtnetlink.h
 protonum: 0
 
 doc:
@@ -49,6 +50,8 @@ definitions:
   -
     name: ifa-flags
     type: flags
+    name-prefix: ifa-f-
+    enum-name:
     entries:
       -
         name: secondary
@@ -124,6 +127,7 @@ attribute-sets:
 operations:
   fixed-header: ifaddrmsg
   enum-model: directional
+  name-prefix: rtm-
   list:
     -
       name: newaddr