CONFIG_ARCH_LH7A404 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_ARCH_LH7A404 (not configurable)

configname: CONFIG_ARCH_LH7A404

Linux Kernel Configuration
└─>LH7A40X Implementations
└─>ARCH_LH7A404
In linux kernel since version 2.6.12  

is depended by
CONFIG_MACH_LPD7A404