ASoC: ABE DAI: support 2 channels for MODEM DAI

MODEM DAI needs to support 2 channels for dual-mic on capture
and to set the McBSP interface as I2S.

Signed-off-by: Francois Mazard <f-mazard@ti.com>
diff --git a/sound/soc/omap/omap-abe.c b/sound/soc/omap/omap-abe.c
index 3415efe..dc0e441 100644
--- a/sound/soc/omap/omap-abe.c
+++ b/sound/soc/omap/omap-abe.c
@@ -1181,14 +1181,14 @@
 		.playback = {
 			.stream_name = "Voice Playback",
 			.channels_min = 1,
-			.channels_max = 1,
+			.channels_max = 2,
 			.rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000,
 			.formats = OMAP_ABE_FORMATS | SNDRV_PCM_FMTBIT_S16_LE,
 		},
 		.capture = {
 			.stream_name = "Voice Capture",
 			.channels_min = 1,
-			.channels_max = 1,
+			.channels_max = 2,
 			.rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000,
 			.formats = OMAP_ABE_FORMATS | SNDRV_PCM_FMTBIT_S16_LE,
 		},