audio HAL: add support for MMAP IRQ mode streams.

Introduce MMAP NOIRQ in shared mode.

CRs-Fixed: 2071843
Change-Id: I79ee079475d23f01aaf730a488b79831fd070df1
diff --git a/hal/msm8916/platform.h b/hal/msm8916/platform.h
index 6aa4dc1..7a950a8 100644
--- a/hal/msm8916/platform.h
+++ b/hal/msm8916/platform.h
@@ -350,6 +350,8 @@
 #define VOLTE_CALL_PCM_DEVICE 15
 #define QCHAT_CALL_PCM_DEVICE 37
 #define VOWLAN_CALL_PCM_DEVICE 16
+#define MMAP_PLAYBACK_PCM_DEVICE 2 // XXX: This must be overwritten
+#define MMAP_RECORD_PCM_DEVICE 2 // XXX: This must be overwritten
 
 #define AFE_PROXY_PLAYBACK_PCM_DEVICE 7
 #define AFE_PROXY_RECORD_PCM_DEVICE 8