hal: Add missing offload changes.

Compressed offload device number and entry from the device
table is missing due to merge issue. Add the device number
to fix offload playback issues.

Change-Id: Ia3eb0e3aaef1e1a73eda5d70bb8f16711ddd182f
diff --git a/hal/msm8974/platform.h b/hal/msm8974/platform.h
index 86dbe1b..444832f 100644
--- a/hal/msm8974/platform.h
+++ b/hal/msm8974/platform.h
@@ -163,6 +163,8 @@
 #define QCHAT_CALL_PCM_DEVICE 20
 #endif
 
+#define PLAYBACK_OFFLOAD_DEVICE 9
+
 #ifdef PLATFORM_MSM8610
 #define LOWLATENCY_PCM_DEVICE 12
 #else