PfcWdAclHandler should query acl stats instead of queue stats for accuracy

[pinky-nexthop]

For some chips, the egress acl hits do not show up as queue drops. Hence the pfcwd stats look like.

 QUEUE    STATUS    STORM DETECTED/RESTORED    TX OK/DROP    RX OK/DROP    TX LAST OK/DROP    RX LAST OK/DROP
------------  --------  -------------------------  ------------  ------------  -----------------  -----------------
Ethernet16:4   stormed                      1/0         100/0           0/0              100/0                0/0

Current PfcWdAclHandler queries the following stats which can be inaccurate as show above.

        SAI_QUEUE_STAT_PACKETS,
        SAI_QUEUE_STAT_DROPPED_PACKETS

Since Acls are programmed to get to take the action, acl counters - SAI_ACL_COUNTER_ATTR_PACKETS should be used to show the egress/ingress drops.