hal: Add incall stereo capture

Add mixer control to pass channel config to kernel
to support incall stereo capture.

Bug: 79869195
Test: voice call regression

Change-Id: Ic2c9ebfc42cfc7a6e0d1a9facb4d2658f6c343cb
diff --git a/hal/msm8916/platform.c b/hal/msm8916/platform.c
index 5c528d7..61260b8 100644
--- a/hal/msm8916/platform.c
+++ b/hal/msm8916/platform.c
@@ -2146,6 +2146,13 @@
     return ret;
 }
 
+int platform_set_incall_recording_session_channels(void *platform __unused,
+                                             uint32_t channel_count __unused)
+{
+    return 0;
+}
+
+
 int platform_stop_incall_recording_usecase(void *platform __unused)
 {
     return 0;