CONFIG_ARM64_64K_PAGES is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

Enable 64KB pages support

configname: CONFIG_ARM64_64K_PAGES

Linux Kernel Configuration
└─>Kernel Features
└─>Enable 64KB pages support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This feature enables 64KB pages support (4KB by default)
allowing only two levels of page tables and faster TLB
look-up. AArch32 emulation is not available when this feature
is enabled.