CONFIG_MACH_BONITO is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_MACH_BONITO.
Result is shown for kernelversion 6.2.5

bonito board

modulename: board-bonito.ko

configname: CONFIG_MACH_BONITO

Linux Kernel Configuration
└─>bonito board
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/arm/mach-shmobile/board-bonito.c