sound/soc/amd/Makefile - kernel/msm-4.19 - Gitiles

 acp_audio_dma-objs := acp-pcm-dma.o
 snd-soc-acp-rt5645-mach-objs := acp-rt5645.o

 obj-$(CONFIG_SND_SOC_AMD_ACP) += acp_audio_dma.o
 obj-$(CONFIG_SND_SOC_AMD_CZ_RT5645_MACH) += snd-soc-acp-rt5645-mach.o
	acp_audio_dma-objs := acp-pcm-dma.o
	snd-soc-acp-rt5645-mach-objs := acp-rt5645.o

	obj-$(CONFIG_SND_SOC_AMD_ACP) += acp_audio_dma.o
	obj-$(CONFIG_SND_SOC_AMD_CZ_RT5645_MACH) += snd-soc-acp-rt5645-mach.o