[SOUND] Sparc CS4231: Use 64 for period_bytes_min

This matches what the ISA cs4231 driver uses.

Tested by Georg Chini.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

sound/sparc/cs4231.c

@@ -1268,7 +1268,7 @@ static struct snd_pcm_hardware snd_cs4231_playback =
 	.channels_min		= 1,
 	.channels_max		= 2,
 	.buffer_bytes_max	= (32*1024),
-	.period_bytes_min	= 256,
+	.period_bytes_min	= 64,
 	.period_bytes_max	= (32*1024),
 	.periods_min		= 1,
 	.periods_max		= 1024,
@@ -1288,7 +1288,7 @@ static struct snd_pcm_hardware snd_cs4231_capture =
 	.channels_min		= 1,
 	.channels_max		= 2,
 	.buffer_bytes_max	= (32*1024),
-	.period_bytes_min	= 256,
+	.period_bytes_min	= 64,
 	.period_bytes_max	= (32*1024),
 	.periods_min		= 1,
 	.periods_max		= 1024,