ALSA: pcm: remove SNDRV_PCM_IOCTL1_GSTATE internal command

SNDRV_PCM_IOCTL1_GSTATE was firstly introduced in v0.9.0, however never
be used and the purpose is missing.

This commit removes the long-abandoned command, bye.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/pcm.h

@@ -104,7 +104,7 @@ struct snd_pcm_ops {
 #define SNDRV_PCM_IOCTL1_RESET		0
 /* 1 is absent slot. */
 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO	2
-#define SNDRV_PCM_IOCTL1_GSTATE		3
+/* 3 is absent slot. */
 #define SNDRV_PCM_IOCTL1_FIFO_SIZE	4
 
 #define SNDRV_PCM_TRIGGER_STOP		0