drm/i915/tgl: TBT AUX should use TC power well ops

drm/i915/tgl: TBT AUX should use TC power well ops

As on ICL, we want to use the Type-C aux handlers for the TBT aux wells
to ensure the DP_AUX_CH_CTL_TBT_IO flag is set properly.

Fixes: 656409bbaf87 ("drm/i915/tgl: Add power well support")
Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200415233435.3064257-1-matthew.d.roper@intel.com
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>