CONFIG_LEMOTE_MACH3A is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_LEMOTE_MACH3A.
Result is shown for kernelversion 6.4.14

Lemote Loongson 3A family machines

modulename: fixup-loongson3.ko

configname: CONFIG_LEMOTE_MACH3A

Machine Type
└─>Lemote Loongson 3A family machines
In linux kernel since version 3.15 (release Date: 2014-06-08)  
Lemote Loongson 3A family machines utilize the 3A revision of
Loongson processor and RS780/SBX00 chipset.

source code:
arch/mips/pci/