drm/i915: Remove DSC register dump

The Display Engine's DSC register values are deducted from the DSC
configuration stored in intel_crtc_state::dsc. The latter one is
dumped in a human-readable format, so dumping the register values is
redundant, remove it.

Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240805150802.3568970-8-imre.deak@intel.com