[Why]
During DP DSC compliance tests, bpc requested would
change between sub-tests, which requires stream
to be recommited.

[How]
Force connector to disconnect and reconnect whenever
there is a bpc change in automated test.
Reviewed-by: NJerry Zuo <Jerry.Zuo@amd.com>
Acked-by: NAlan Liu <HaoPing.Liu@amd.com>
Signed-off-by: NQingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Nhersen wu <hersenxs.wu@amd.com>
Tested-by: NDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>