ALSA: hda - Add snd_hda_codec_flush_*_cache() aliases

It makes easier to understand although these are identical with
snd_hda_codec_resume_*() functions.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index a1cb28f..2d9a51c 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -970,6 +970,10 @@
 			      int direct, unsigned int verb, unsigned int parm);
 void snd_hda_codec_resume_cache(struct hda_codec *codec);
 
+/* it's alias but a bit clearer meaning */
+#define snd_hda_codec_flush_cmd_cache(codec) \
+	snd_hda_codec_resume_cache(codec)
+
 /* the struct for codec->pin_configs */
 struct hda_pincfg {
 	hda_nid_t nid;