audio-lnx: Add support to build sdm670 machine driver as module

When CONFIG_SND_SOC_EXT_CODEC/CONFIG_SND_SOC_INT_CODEC is set to m not y,
"ifdef CONFIG_SND_SOC_EXT_CODEC/CONFIG_SND_SOC_INT_CODEC"
would be false which would cause init functions as dummy functions.
Change to "if IS_ENABLED" and When CONFIG_SND_SOC_EXT_CODEC/
CONFIG_SND_SOC_INT_CODEC is set to y/m, both would set the
condition to true.
Change Makefile to compile machine driver for internal/external
codec as one module.

Change-Id: Ib72f95a24e8a4e657a1e9efc655f92a397b44d32
Signed-off-by: Meng Wang <mwang@codeaurora.org>

asoc/Makefile

@@ -15,19 +15,9 @@ obj-$(CONFIG_SND_SOC_CPE) += snd-soc-cpe.o
 snd-soc-msm8998-objs := msm8998.o
 obj-$(CONFIG_SND_SOC_MACHINE_MSM8998) += snd-soc-msm8998.o
 
-# for SDM660 sound card driver
-snd-soc-sdm660-common-objs := sdm660-common.o
-obj-$(CONFIG_SND_SOC_SDM670) += snd-soc-sdm660-common.o
-
-# for SDM660 sound card driver
-snd-soc-int-codec-objs := sdm660-internal.o
-obj-$(CONFIG_SND_SOC_INT_CODEC) += snd-soc-sdm660-common.o
-obj-$(CONFIG_SND_SOC_INT_CODEC) += snd-soc-int-codec.o
-
-# for SDM660 sound card driver
-snd-soc-ext-codec-objs := sdm660-external.o sdm660-ext-dai-links.o
-obj-$(CONFIG_SND_SOC_EXT_CODEC) += snd-soc-sdm660-common.o
-obj-$(CONFIG_SND_SOC_EXT_CODEC) += snd-soc-ext-codec.o
+# for SDM670 sound card driver
+snd-soc-sdm670-objs := sdm660-common.o sdm660-internal.o sdm660-external.o sdm660-ext-dai-links.o
+obj-$(CONFIG_SND_SOC_SDM670) += snd-soc-sdm670.o
 
 # for SDM845 sound card driver
 snd-soc-sdm845-objs := sdm845.o

asoc/sdm660-external.h

@@ -32,7 +32,7 @@ int msm_ext_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
 			       struct snd_pcm_hw_params *params);
 int msm_snd_card_tavil_late_probe(struct snd_soc_card *card);
 int msm_snd_card_tasha_late_probe(struct snd_soc_card *card);
-#ifdef CONFIG_SND_SOC_EXT_CODEC
+#if IS_ENABLED(CONFIG_SND_SOC_EXT_CODEC)
 int msm_ext_cdc_init(struct platform_device *, struct msm_asoc_mach_data *,
 		     struct snd_soc_card **, struct wcd_mbhc_config *);
 void msm_ext_register_audio_notifier(struct platform_device *pdev);

asoc/sdm660-internal.h

@@ -1,4 +1,4 @@
-/* Copyright (c) 2016, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -15,7 +15,7 @@
 
 #include <sound/soc.h>
 
-#ifdef CONFIG_SND_SOC_INT_CODEC
+#if IS_ENABLED(CONFIG_SND_SOC_INT_CODEC)
 int msm_int_cdc_init(struct platform_device *pdev,
 		     struct msm_asoc_mach_data *pdata,
 		     struct snd_soc_card **card,