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

Marvell Engineering Business Unit (MVEBU) SoCs

modulename: irq-armada-370-xp.ko

configname: CONFIG_ARCH_MVEBU

Linux Kernel Configuration
└─>Marvell Engineering Business Unit (MVEBU) SoCs
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
drivers/irqchip/irq-armada-370-xp.c