hal: Update the correct channel count for dolby configuration

-Wfd supports both 5.1 and stereo. Based on the sink capabilities
 update the correct channel count for dolby configuration for wfd.

CRs-Fixed: 609429
Change-Id: I85b81ba7db7134a6781007393f0f3c2adb5ea138
diff --git a/hal/audio_hw.h b/hal/audio_hw.h
index 205977b..21b7790 100644
--- a/hal/audio_hw.h
+++ b/hal/audio_hw.h
@@ -223,6 +223,7 @@
     bool speaker_lr_swap;
     struct voice voice;
     unsigned int cur_hdmi_channels;
+    unsigned int cur_wfd_channels;
 
     int snd_card;
     void *platform;