CONFIG_MACH_OMAP_H4 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

OMAP 2420 H4 board

modulename: board-h4.ko

configname: CONFIG_MACH_OMAP_H4

Linux Kernel Configuration
└─>OMAP 2420 H4 board
In linux kernel since version 2.6.12  
source code:
arch/arm/mach-omap2/board-h4.c