CONFIG_FSL_GTM is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

CONFIG_FSL_GTM (not configurable)

modulename: fsl_gtm.ko

configname: CONFIG_FSL_GTM

Linux Kernel Configuration
└─>Bus options
└─>FSL_GTM
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Freescale General-purpose Timers support

source code: