CONFIG_SOC_AU1500 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_SOC_AU1500 (not configurable)

modulename: fixup-au1000.ko

configname: CONFIG_SOC_AU1500

Linux/MIPS Kernel Configuration
└─>SOC_AU1500
In linux kernel since version 2.6.12  
source code:

is selected by
CONFIG_SND_AU1X00