drm/i915/pps: only touch the vlv_ members on VLV/CHV
While the struct intel_pps vlv_pps_pipe and vlv_active_pipe members are
only relevant for VLV/CHV, we still initialize them on all platforms and
check them on BXT/GLK. Wrap all access inside VLV/CHV checks for
consistency.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/158c7b30e56d22aa3f9c9e51e87b9d89687d74d5.1726681620.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>