CONFIG_MACH_MX27 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_MACH_MX27 (not configurable)

configname: CONFIG_MACH_MX27

Linux Kernel Configuration
└─>Freescale i.MX family
└─>MACH_MX27
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
depends
CONFIG_ARCH_MXC

is selected by
CONFIG_VIDEO_MX2

is depended by
CONFIG_SOC_IMX27