CONFIG_ARM64_ERRATUM_2077057 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

Cortex-A510: 2077057: workaround software-step corrupting SPSR_EL2

configname: CONFIG_ARM64_ERRATUM_2077057

Linux Kernel Configuration
└─>Kernel Features
└─>ARM errata workarounds via the alternatives framework
└─>Cortex-A510: 2077057: workaround software-step corrupting SPSR_EL2
In linux kernel since version 5.2 (release Date: 2019-07-07)  
This option adds the workaround for ARM Cortex-A510 erratum 2077057.
Affected Cortex-A510 may corrupt SPSR_EL2 when the a step exception is
expected, but a Pointer Authentication trap is taken instead. The
erratum causes SPSR_EL1 to be copied to SPSR_EL2, which could allow
EL1 to cause a return to EL2 with a guest controlled ELR_EL2.

This can only happen when EL2 is stepping EL1.

When these conditions occur, the SPSR_EL2 value is unchanged from the
previous guest entry, and can be restored from the in-memory copy.

If unsure, say Y.