[Why]
This function is not being used, it was left in
when introducing DCN2

[How]
Remove the function
Signed-off-by: NQingqing Zhuo <qingqing.zhuo@amd.com>
Reviewed-by: NEric Bernstein <Eric.Bernstein@amd.com>
Acked-by: NBhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>