audio-driver: Update build files for LA automotive

enable conditional build for audio driver modules for LA
automotive.

Change-Id: Ifb18ea6f8af531a99e29904c2245424657b42df7
Signed-off-by: Cong Tang <congt@codeaurora.org>

asoc/machine_815x_init.c

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
  */
 
 #include <linux/kernel.h>
@@ -10,14 +10,12 @@
 static int __init audio_machine_815x_init(void)
 {
 	sm8150_init();
-	sa8155_init();
 	return 0;
 }
 
 static void audio_machine_815x_exit(void)
 {
 	sm8150_exit();
-	sa8155_exit();
 }
 
 module_init(audio_machine_815x_init);