ynl: devlink: add missing board-serial-number

JIRA: https://issues.redhat.com/browse/RHEL-75600

Upstream commit(s):
commit 3e25c1a
Author: Jiri Pirko <[email protected]>
Date:   Thu Mar 20 09:59:44 2025 +0100

    ynl: devlink: add missing board-serial-number

    Add a missing attribute of board serial number.

    Signed-off-by: Jiri Pirko <[email protected]>
    Reviewed-by: Simon Horman <[email protected]>
    Reviewed-by: Kalesh AP <[email protected]>
    Link: https://patch.msgid.link/[email protected]
    Signed-off-by: Jakub Kicinski <[email protected]>

Signed-off-by: Petr Oros <[email protected]>

Author: orosp

Documentation/netlink/specs/devlink.yaml

@@ -1868,6 +1868,7 @@ operations:
             - info-version-fixed
             - info-version-running
             - info-version-stored
+            - info-board-serial-number
       dump:
         reply: *info-get-reply