default or selected kernelversion does not have config value CONFIG_RTC_DRV_NUC900.
Result is shown for kernelversion 6.8.2

NUC910/NUC920 RTC driver

modulename: rtc-nuc900.ko

configname: CONFIG_RTC_DRV_NUC900

Linux Kernel Configuration
└─>Device Drivers
└─>Real Time Clock
└─>NUC910/NUC920 RTC driver
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
If you say yes here you get support for the RTC subsystem of the
NUC910/NUC920 used in embedded systems.

source code: