hal: Update backend for headset-mic

audio-record via headset not working
due to incorrect backend

Update appropriate headset-mic backend

Change-Id: I612bd50eb7ab305865ee5d6bc7cd5e984a1a5e38
diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index 3f951bc..adfeaa5 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -3000,9 +3000,9 @@
         //for headset-mic. This is to capture separate data from headset-mic and handset-mic.
 #ifdef CONCURRENT_CAPTURE_ENABLED
         my_data->current_backend_cfg[HEADSET_TX_BACKEND].bitwidth_mixer_ctl =
-            strdup("SLIM_1_RX Format");
+            strdup("SLIM_1_TX Format");
         my_data->current_backend_cfg[HEADSET_TX_BACKEND].samplerate_mixer_ctl =
-            strdup("SLIM_1_RX SampleRate");
+            strdup("SLIM_1_TX SampleRate");
 #endif
     }