Use dot1p to tc mapping for backend switches

[wendani]

- What I did

- How I did it

- How to verify it
On brcm dut

    "DOT1P_TO_TC_MAP": {
        "AZURE": {
            "1": "1",
            "0": "0",
            "3": "3",
            "2": "2",
            "5": "5",
            "4": "4",
            "7": "7",
            "6": "6"
        }
    },

    "PORT_QOS_MAP": {
        "Ethernet4,Ethernet8,Ethernet12,Ethernet16,Ethernet20,Ethernet24,Ethernet28,Ethernet32,Ethernet36,Ethernet40,Ethernet44,Ethernet48,Ethernet52,Ethernet56,Ethernet60,Ethernet88,Ethernet92,Ethernet96,Ethernet100,Ethernet104,Ethernet108,Ethernet112,Ethernet116,Ethernet120,Ethernet124": {
            "tc_to_pg_map": "[TC_TO_PRIORITY_GROUP_MAP|AZURE]",
            "tc_to_queue_map": "[TC_TO_QUEUE_MAP|AZURE]",
            "dot1p_to_tc_map": "[DOT1P_TO_TC_MAP|AZURE]",
            "pfc_enable": "3,4",
            "pfc_to_queue_map": "[MAP_PFC_PRIORITY_TO_QUEUE|AZURE]"
        }
    },

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[wendani]

retest this please