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

MARZEN board

modulename: board-marzen-reference.ko

and/or

board-marzen.ko

configname: CONFIG_MACH_MARZEN

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