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

MIPS Malta board

modulename: fixup-malta.ko

configname: CONFIG_MIPS_MALTA

System type
└─>MIPS Malta board
In linux kernel since version 2.6.12  
This enables support for the MIPS Technologies Malta evaluation
board.

source code:
arch/mips/pci/