CONFIG_ARC_MMU_V4 is not available for thedefaultarchitecture x86.
Result is shown for architecture arc

MMU v4

configname: CONFIG_ARC_MMU_V4

MMU Version
└─>MMU v4
In linux kernel since version 3.10 (release Date: 2013-06-30)  

is selected by
CONFIG_ARC_HAS_PAE40