Update WARM START FINALIZER to wait for linkmgrd to reconcile (#11477)

Spanning from sonic-net/sonic-linkmgrd#76, this PR is to update warm restart finalizer to wait for linkmgrd to be reconciled.

sign-off: Jing Zhang zhangjing@microsoft.com

Why I did it
To make sure finalizer save config after linkmgrd's reconciliation.

How I did it
Add linkmgrd to the reconciliation wait list of warmboot finalizer.

How to verify it
Verified on lab device, linkmgrd reconciled as expected.

files/image_config/warmboot-finalizer/finalize-warmboot.sh

@@ -10,6 +10,7 @@ declare -A RECONCILE_COMPONENTS=( \
                         ["swss"]="orchagent neighsyncd" \
                         ["bgp"]="bgp"                   \
                         ["nat"]="natsyncd"              \
+                        ["mux"]="linkmgrd"              \
                        )
 
 for reconcile_file in $(find /etc/sonic/ -iname '*_reconcile' -type f); do