CONFIG_ARM_SINGLE_ARMV7M is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

ARMv7-M based platforms (Cortex-M0/M3/M4)

configname: CONFIG_ARM_SINGLE_ARMV7M

ARM system type
└─>ARMv7-M based platforms (Cortex-M0/M3/M4)
In linux kernel since version 3.10 (release Date: 2013-06-30)  

depends
NOT CONFIG_MMU