Revert "drm/i915: Remove unneeded hack now for CDCLK"

Revert "drm/i915: Remove unneeded hack now for CDCLK"

This reverts commit 8bc35ed8651e21ace91519c529e45f883c8d9af5.

Unfortunately according to our recent findings there is still some
unidentified factor, requiring CDCLK to be set higher - otherwise we
still get underruns on some multipipe configurations, despite CDCLK
being set according to BSpec formula. So getting again back into debug
mode to indentify the cause, meanwhile setting CDCLK=Pixel rate back in
order to remove regression in 10% of the cases due to FIFO underruns.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Fixes: 1c8468987b3a ("drm/i915: Adjust CDCLK accordingly to our DBuf bw needs")
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200608065552.21728-1-stanislav.lisovskiy@intel.com