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

Socionext Synquacer: Workaround for GICv3 pre-ITS

configname: CONFIG_SOCIONEXT_SYNQUACER_PREITS

Linux Kernel Configuration
└─>Kernel Features
└─>ARM errata workarounds via the alternatives framework
└─>Socionext Synquacer: Workaround for GICv3 pre-ITS
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Socionext Synquacer SoCs implement a separate h/w block to generate
MSI doorbell writes with non-zero values for the device ID.

If unsure, say Y.