hal: Update the FM_RX_VOLUME control to SEC MI2S LOOPBACK Volume

Add API to update FM_RX_VOLUME control for yupik target.

Change-Id: I6f8065b4ff130ba609a28d0c15a2b83659c501a5
Signed-off-by: Harshal Ahire <hahire@codeaurora.org>
diff --git a/hal/platform_api.h b/hal/platform_api.h
index ca72708..9d08378 100644
--- a/hal/platform_api.h
+++ b/hal/platform_api.h
@@ -435,4 +435,5 @@
                                       bool enable);
 void platform_reset_island_power_status(void *platform, snd_device_t snd_device);
 void platform_is_volume_boost_supported_device(void *platform, struct listnode *devices);
+const char *platform_get_mixer_FM_RX_control(struct audio_device *adev);
 #endif // AUDIO_PLATFORM_API_H