ALSA: snd-atmel-abdac: increase periods_min to 6 instead of 4

This patch increases periods_min to 6 from 4, this will remove any
hickups where the buffer is not filled fast enough from user space.

Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/atmel/abdac.c

@@ -165,7 +165,7 @@ static struct snd_pcm_hardware atmel_abdac_hw = {
 	.buffer_bytes_max	= 64 * 4096,
 	.period_bytes_min	= 4096,
 	.period_bytes_max	= 4096,
-	.periods_min		= 4,
+	.periods_min		= 6,
 	.periods_max		= 64,
 };