audio: Set SLIM_0_RX Channels mixer control from mixer paths

Set channel config for SLIM_0_RX based off mixer paths.
This allows flexibility on devices with only mono channel support

CRs-Fixed: 2130140
Change-Id: I21edfc3f08b6ab435fb22cb7de6a201aa7e2c054
diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index 61ef223..741d061 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -2248,8 +2248,6 @@
         strdup("SLIM_0_RX Format");
     my_data->current_backend_cfg[DEFAULT_CODEC_BACKEND].samplerate_mixer_ctl =
         strdup("SLIM_0_RX SampleRate");
-    my_data->current_backend_cfg[DEFAULT_CODEC_BACKEND].channels_mixer_ctl =
-        strdup("SLIM_0_RX Channels");
 
     my_data->current_backend_cfg[DSD_NATIVE_BACKEND].bitwidth_mixer_ctl =
         strdup("SLIM_2_RX Format");