CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT

Memory Protection Keys

modulename: pkeys.ko

configname: CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS

Linux Kernel Configuration
└─>Processor type and features
└─>Memory Protection Keys
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Memory Protection Keys provides a mechanism for enforcing
page-based protections, but without requiring modification of the
page tables when an application changes protection domains.

For details, see