ALSA: hda - Combine snd_hda_codec_flush_*_cache() to a single function

Since both snd_hda_codec_flush_amp_cache() and
snd_hda_codec_flush_cmd_cache() are called usually at the same time,
we can simply combine them to a single function,
snd_hda_codec_flush_cache().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 6eb9551..feb8cef 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -621,7 +621,7 @@
 		(dir == HDA_OUTPUT ? AC_AMP_SET_OUTPUT : AC_AMP_SET_INPUT);
 
 	/* flush all cached amps at first */
-	snd_hda_codec_flush_amp_cache(codec);
+	snd_hda_codec_flush_cache(codec);
 
 	/* we care only right channel */
 	val = snd_hda_codec_amp_read(codec, nid, 1, dir, 0);