CONFIG_MACH_AP4EVB is not available for the selected architecture x86.
Result is shown for architecture arm

AP4EVB board

modulename: board-ap4evb.ko

configname: CONFIG_MACH_AP4EVB

Linux Kernel Configuration
└─>AP4EVB board
In linux kernel since version 2.6.34 (release Date: 2010-05-16)
source code:
/arch/arm/mach-shmobile/board-ap4evb.c