CONFIG_ARM64_PA_BITS_52 is not available for the default architecture x86.
Result is shown for architecture arm64

52-bit (ARMv8.2)

configname: CONFIG_ARM64_PA_BITS_52

Physical address space size
└─> 52-bit (ARMv8.2)

Enable support for a 52-bit physical address space, introduced as
part of the ARMv8.2-LPA extension.

With this enabled, the kernel will also continue to work on CPUs that
do not support ARMv8.2-LPA, but with some added memory overhead (and
minor performance overhead).