CONFIG_ARCH_LH7A40X is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Sharp LH7A40X

configname: CONFIG_ARCH_LH7A40X

ARM system type
└─>Sharp LH7A40X
In linux kernel since version 2.6.12  
Say Y here for systems based on one of the Sharp LH7A40X
System on a Chip processors. These CPUs include an ARM922T
core with a wide array of integrated devices for
hand-held and low-power applications.

is selected by
CONFIG_CPU_ARM922T