default or selected kernelversion does not have config value CONFIG_MTD_NAND_RTC_FROM4.
Result is shown for kernelversion 6.2.5

Renesas Flash ROM 4-slot interface board (FROM_BOARD4)

modulename: rtc_from4.ko

configname: CONFIG_MTD_NAND_RTC_FROM4

Linux Kernel Configuration
└─>Device Drivers
└─>Memory Technology Device (MTD) support
└─>NAND Device Support
└─>Renesas Flash ROM 4-slot interface board (FROM_BOARD4)
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This enables the driver for the Renesas Technology AG-AND
flash interface board (FROM_BOARD4)

source code:
drivers/mtd/nand//rtc_from4.c