ASoC: Add WM8958 enhanced EQ support

DSP2 in the WM8958 can be used to support an upgraded EQ for use in
demanding applications.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>

sound/soc/codecs/wm8994.c

@@ -3142,6 +3142,8 @@ static int  wm8994_codec_remove(struct snd_soc_codec *codec)
 		release_firmware(wm8994->mbc);
 	if (wm8994->mbc_vss)
 		release_firmware(wm8994->mbc_vss);
+	if (wm8994->enh_eq)
+		release_firmware(wm8994->enh_eq);
 	kfree(wm8994->retune_mobile_texts);
 	kfree(wm8994->drc_texts);
 	kfree(wm8994);