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

IMG Pistachio SoC based boards

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.