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

SH-Mobile Series

configname: CONFIG_ARCH_SHMOBILE_MULTI

Linux Kernel Configuration
└─>SH-Mobile Series
In linux kernel since version 3.12 (release Date: 2013-11-03)  

depends
CONFIG_MMU