ALSA: x86: Rearrange defines

We have two header files and everything is mixed up chaotically.
Move the chip-specific definitions like the hardware registers to
intel_hdmi_lpe_audio.h, and the rest, the implementation specific
stuff into intel_hdmi_audio.h.

In addition, put some more comments to the register fields, and fix
the incorrect name prefix for AUD_HDMI_STATUS bits, too.

The whole changes are merely a code shuffling, and there is no
functional change.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/x86/intel_hdmi_audio.c

@@ -252,7 +252,8 @@ static void had_ack_irqs(struct snd_intelhad *ctx)
 /* Reset buffer pointers */
 static void had_reset_audio(struct snd_intelhad *intelhaddata)
 {
-	had_write_register(intelhaddata, AUD_HDMI_STATUS, 1);
+	had_write_register(intelhaddata, AUD_HDMI_STATUS,
+			   AUD_HDMI_STATUSG_MASK_FUNCRST);
 	had_write_register(intelhaddata, AUD_HDMI_STATUS, 0);
 }
 
@@ -989,7 +990,7 @@ static void wait_clear_underrun_bit(struct snd_intelhad *intelhaddata)
 	for (i = 0; i < MAX_CNT; i++) {
 		/* clear bit30, 31 AUD_HDMI_STATUS */
 		had_read_register(intelhaddata, AUD_HDMI_STATUS, &val);
-		if (!(val & AUD_CONFIG_MASK_UNDERRUN))
+		if (!(val & AUD_HDMI_STATUS_MASK_UNDERRUN))
 			return;
 		had_write_register(intelhaddata, AUD_HDMI_STATUS, val);
 	}