CONFIG_MACH_PISTACHIO is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_MACH_PISTACHIO.
Result is shown for kernelversion 6.9.9

IMG Pistachio SoC based boards

modulename: pistachio_marduk.dtb.ko

configname: CONFIG_MACH_PISTACHIO

System type
└─>IMG Pistachio SoC based boards
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This enables support for the IMG Pistachio SoC platform.

source code:
arch/mips/boot/dts/img/