drm/i915/audio: Nuke leftover ROUNDING_FACTOR

Remove some leftovers I missed in commit
2dd43144 ("drm/i915: Streamline the artihmetic")

Cc: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Cc: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Cc: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221026170150.2654-3-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/display/intel_audio.c

@@ -626,8 +626,6 @@ static void enable_audio_dsc_wa(struct intel_encoder *encoder,
 	intel_de_write(i915, AUD_CONFIG_BE, val);
 }
 
-#undef ROUNDING_FACTOR
-
 static void hsw_audio_codec_enable(struct intel_encoder *encoder,
 				   const struct intel_crtc_state *crtc_state,
 				   const struct drm_connector_state *conn_state)