hal: compilation fix for extended feature flags

- Fix compilation error for offload, Dolby,
  HDMI pass through, FLAC decoder, and hardware
  accelerated effects when extended feature
  flags are disabled.

Change-Id: I5b36d7668f63a396ed930d62c0337c2c3f311c95
diff --git a/hal/platform_api.h b/hal/platform_api.h
index 5542a6d..59cb554 100644
--- a/hal/platform_api.h
+++ b/hal/platform_api.h
@@ -92,6 +92,7 @@
 struct audio_offload_info_t;
 uint32_t platform_get_compress_offload_buffer_size(audio_offload_info_t* info);
 uint32_t platform_get_pcm_offload_buffer_size(audio_offload_info_t* info);
+bool platform_use_small_buffer(audio_offload_info_t* info);
 uint32_t platform_get_compress_passthrough_buffer_size(audio_offload_info_t* info);
 
 bool platform_check_and_set_codec_backend_cfg(struct audio_device* adev,