hal: Support config selection for playback on speaker

Support bit width selection for playback on speakers based on
platform info.

Change-Id: I8dd2cc7049186e7468615a43db550d7d580a81d1
diff --git a/hal/platform_api.h b/hal/platform_api.h
index b11a0c7..534630c 100644
--- a/hal/platform_api.h
+++ b/hal/platform_api.h
@@ -36,6 +36,8 @@
 int platform_get_fluence_type(void *platform, char *value, uint32_t len);
 int platform_set_snd_device_acdb_id(snd_device_t snd_device, unsigned int acdb_id);
 int platform_get_snd_device_acdb_id(snd_device_t snd_device);
+int platform_set_snd_device_bit_width(snd_device_t snd_device, unsigned int bit_width);
+int platform_get_snd_device_bit_width(snd_device_t snd_device);
 int platform_send_audio_calibration(void *platform, snd_device_t snd_device,
                                     int app_type, int sample_rate);
 int platform_get_default_app_type(void *platform);