CONFIG_MACH_RD88F5181L_GE is not available for the selected architecture x86.
Result is shown for architecture arm

Marvell Orion-VoIP GE Reference Design

modulename: rd88f5181l-ge-setup.ko

configname: CONFIG_MACH_RD88F5181L_GE

Linux Kernel Configuration
└─>Marvell Orion
└─>Marvell Orion-VoIP GE Reference Design
In linux kernel since version 2.6.27 (release Date: 2008-10-09)
Say 'Y' here if you want your kernel to support the
Marvell Orion-VoIP GE (88F5181L) RD.
source code:
arch/arm/mach-orion5x/rd88f5181l-ge-setup.c