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

Marvell's PXA168 GuruPlug Display (gplugD) Board

modulename: gplugd.ko

configname: CONFIG_MACH_GPLUGD

Linux Kernel Configuration
└─>Marvell PXA168/910/MMP2/MMP3
└─>Marvell PXA168/910/MMP2 Implementations
└─>Marvell's PXA168 GuruPlug Display (gplugD) Board
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say 'Y' here if you want to support the Marvell PXA168-based
GuruPlug Display (gplugD) Board

source code:
arch/arm/mach-mmp/gplugd.c