Now that pll_id is not used anymore for combophy, reduce its scope.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190322223751.22089-6-lucas.demarchi@intel.comReviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>