CONFIG_SOC_AU1550 is not available for the selected architecture x86.
Result is shown for architecture mips

SOC_AU1550

modulename: fixup-au1000.ko

configname: CONFIG_SOC_AU1550

Au1X00 SOC Type
└─>SOC_AU1550
In linux kernel since version 2.6.12 )
source code:
arch/mips/pci/