ASoC: msm: Add support for 4 channel recording

Enable 4 channel recording in kernel

Signed-off-by: Mingming Yin <mingming@codeaurora.org>
Change-Id: I91c76e21a4080c0542a63555f0258010ed061fc0
diff --git a/include/sound/apr_audio.h b/include/sound/apr_audio.h
index f71d743..782ee8d 100644
--- a/include/sound/apr_audio.h
+++ b/include/sound/apr_audio.h
@@ -992,6 +992,7 @@
 		struct asm_qcelp13_read_cfg qcelp13;
 		struct asm_sbc_read_cfg     sbc;
 		struct asm_amrwb_read_cfg   amrwb;
+		struct asm_multi_channel_pcm_fmt_blk      mpcm;
 	} __attribute__((packed)) cfg;
 };