drm/i915/tgl: Update DPLL clock reference register

This register definition changed from ICL and has now another meaning.
Use the right bits on TGL.

Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190711173115.28296-22-lucas.demarchi@intel.com
2 files changed