Revert "drm/i915/dp: Correctly advertise HBR3 for GEN11+"

The initial CI results did not include a TGL system which includes a
panel that is having issues with patch. Revert while we triage.

This reverts commit 680c45c7

.

Signed-off-by: Matt Atwood <matthew.s.atwood@intel.com>
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200702230957.30536-1-matthew.s.atwood@intel.com