kernelconfig_penguin
CONFIG_ARCH_REALTEK is not available for the default architecture x86.
Result is shown for architecture arm64
is selected by
CONFIG_RTD119X_WATCHDOG

Realtek Platforms

configname: CONFIG_ARCH_REALTEK

Linux Kernel Configuration
└─> Platform selection
└─> Realtek Platforms

This enables support for the ARMv8 based Realtek chipsets,
like the RTD1295.