[202012][sonic-linkmgrd] submodule update (#12212)

[202012][sonic-linkmgrd] submodule update

commit efee4d5b807887bae14c16a8a297756739fcc17e (HEAD -> 202012, upstream/202012)
Author: Jing Zhang <zhangjing@microsoft.com>
Date:   Mon Oct 3 09:40:55 2022 -0700

    [Active-Standby] fix syslog flood caused by `unkown -> standby` switchovers  (#137)
    
    Description of PR
    Summary:
    Fixes # (issue)
    
    This is to fix the syslog flood issue caused by repeated switchovers from unknown to standby. The scenario trigged the issue was when xcvrd timed out toggles requests but was able to probe:
    Linkmgrd toggles to standby
    -> toggles fails, xcvrd writes unknown
    -> linkmgrd probes mux state
    -> xcvrd writes standby
    -> linkmgrd toggles to standby (previous mux state was unknown, switching to match)
    -> toggles fails, xcvrd writes unknown
    -> ... ...
    
    sign-off: Jing Zhang zhangjing@microsoft.com

commit d4de3d31db6512b045c050533cd9e11a92522916
Author: Jing Zhang <zhangjing@microsoft.com>
Date:   Tue Sep 27 10:36:59 2022 -0700

    [202012][Cherry-pick] Post switchover reasons to STATE DB (#138)

    Description of PR
    Summary:
    Fixes # (issue)

    Cherry-pick conflict:
    ea68e8c Jing Zhang Wed Sep 21 10:52:18 2022 -0700 Post switchover reasons to STATE DB (#131)
    a5a9f90 Hua Liu Fri Sep 16 09:54:32 2022 +0800 Install libyang to azure pipeline (#132)

    sign-off: Jing Zhang zhangjing@microsoft.com