netlink: specs: conntrack: tweak definition of obsolete attrs

CTA_SECMARK, CTA_COUNTERS32_{PACKETS,BYTES} are all obsolete
be32 attrs. Since they are obsolete we don't bother with
the byte-order annotation, but let's be consistent about
marking them as u32 with doc: obsolete.

The attrs were obsoleted by:
commit 584015727a ("netfilter: accounting rework: ct_extend + 64bit counters (v4)")
commit 1cc63249ad ("conntrack: export lsm context rather than internal secid via netlink")

Reviewed-by: Hangbin Liu <liuhangbin@kylinos.cn>
Link: https://patch.msgid.link/20260910003852.2184031-8-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/netlink/specs/conntrack.yaml

@@ -116,9 +116,11 @@ attribute-sets:
       -
         name: packets-old
         type: u32
+        doc: obsolete
       -
         name: bytes-old
         type: u32
+        doc: obsolete
       -
         name: pad
         type: pad
@@ -465,7 +467,7 @@ attribute-sets:
         nested-attributes: seqadj-attrs
       -
         name: secmark
-        type: binary
+        type: u32
         doc: obsolete
       -
         name: zone