CONFIG_ARCH_MULTI_V6 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

ARMv6 based platforms (ARM11)

configname: CONFIG_ARCH_MULTI_V6

Linux Kernel Configuration
└─>Platform selection
└─>ARMv6 based platforms (ARM11)
In linux kernel since version 3.1 (release Date: 2011-10-24)  

depends
CONFIG_MMU