CONFIG_CPU_SUPPORTS_MSA is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_CPU_SUPPORTS_MSA (not configurable)

configname: CONFIG_CPU_SUPPORTS_MSA

Linux Kernel Configuration
└─>Kernel type
└─>CPU_SUPPORTS_MSA
In linux kernel since version 3.10 (release Date: 2013-06-30)  
is depended by
CONFIG_CPU_LOONGSON64