netlink: specs: add big-endian byte-order for u32 IPv4 addresses

The fix commit converted several IPv4 address attributes from binary
to u32, but forgot to specify byte-order: big-endian. Without this,
YNL tools display IPv4 addresses incorrectly due to host-endian
interpretation.

Add the missing byte-order: big-endian to all affected u32 IPv4
address fields to ensure correct parsing and display.

Fixes: 1064d521d1 ("netlink: specs: support ipv4-or-v6 for dual-stack fields")
Reported-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
Link: https://patch.msgid.link/20251125112048.37631-1-liuhangbin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/netlink/specs/rt-addr.yaml

@@ -97,6 +97,7 @@ attribute-sets:
       -
         name: broadcast
         type: u32
+        byte-order: big-endian
         display-hint: ipv4
       -
         name: anycast

Documentation/netlink/specs/rt-link.yaml

@@ -1869,6 +1869,7 @@ attribute-sets:
       -
         name: remote
         type: u32
+        byte-order: big-endian
         display-hint: ipv4
       -
         name: ttl
@@ -1987,6 +1988,7 @@ attribute-sets:
       -
         name: 6rd-relay-prefix
         type: u32
+        byte-order: big-endian
         display-hint: ipv4
       -
         name: 6rd-prefixlen