CONFIG_ARM64_HAFT is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

Support for Hardware managed Access Flag for Table Descriptors

configname: CONFIG_ARM64_HAFT

Linux Kernel Configuration
└─>Kernel Features
└─>ARMv8.9 architectural features
└─>Support for Hardware managed Access Flag for Table Descriptors
In linux kernel since version 6.13 (release Date: 2025-01-19)  
The ARMv8.9/ARMv9.5 introduces the feature Hardware managed Access
Flag for Table descriptors. When enabled an architectural executed
memory access will update the Access Flag in each Table descriptor
which is accessed during the translation table walk and for which
the Access Flag is 0. The Access Flag of the Table descriptor use
the same bit of PTE_AF.

The feature will only be enabled if all the CPUs in the system
support this feature. If unsure, say Y.