CONFIG_ARCH_MXC_AUDMUX_V1 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_ARCH_MXC_AUDMUX_V1 (not configurable)

modulename: audmux-v1.ko

configname: CONFIG_ARCH_MXC_AUDMUX_V1

Linux Kernel Configuration
└─>ARCH_MXC_AUDMUX_V1
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
source code:
arch/arm/plat-mxc/audmux-v1.c
depends
CONFIG_ARCH_MXC