test_dscp_to_tc_map_applied_to_switch is blocking PR testing

[bingwang-ms]

Description

We are seeing test_dscp_to_tc_map_applied_to_switch is consistently failing in PR testing

 fvs = self.asic_db.get_entry(self.ASIC_SWITCH_STR, switch_oid)
>           assert("SAI_SWITCH_ATTR_QOS_DSCP_TO_TC_MAP" not in fvs)
E           AssertionError: assert 'SAI_SWITCH_ATTR_QOS_DSCP_TO_TC_MAP' not in {'NULL': 'NULL', 'SAI_SWITCH_ATTR_FDB_EVENT_NOTIFY': '0x564d95e06a69', 'SAI_SWITCH_ATTR_INIT_SWITCH': 'true', 'SAI_SWITCH_ATTR_PORT_STATE_CHANGE_NOTIFY': '0x564d95e06a89', ...}

Steps to reproduce the issue:

1. Run PR testing

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