CONFIG_ARCH_MSM8X60 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

MSM8X60

modulename: gpiomux-8x60.ko

and/or

board-dt-8660.ko

configname: CONFIG_ARCH_MSM8X60

Linux Kernel Configuration
└─>MSM8X60
In linux kernel since version 2.6.37 (release Date: 2011-01-04)  
source code:
arch/arm/mach-msm/board-dt-8660.c