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

Support for LASAT Networks platforms

modulename: pci-lasat.ko

configname: CONFIG_LASAT

Linux/MIPS Kernel Configuration
└─>Machine selection
└─>Support for LASAT Networks platforms
In linux kernel since version 2.6.12  
source code:
arch/mips/pci/pci-lasat.c