CONFIG_MACH_BONITO is not available for the selected architecture x86.
Result is shown for architecture arm

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