default or selected kernelversion does not have config value CONFIG_BD70528_WATCHDOG.
Result is shown for kernelversion 6.9.8

ROHM BD70528 PMIC Watchdog

modulename: bd70528_wdt.ko

configname: CONFIG_BD70528_WATCHDOG

Linux Kernel Configuration
└─>Device Drivers
└─>Watchdog Timer Support
└─>ROHM BD70528 PMIC Watchdog
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Support for the watchdog in the ROHM BD70528 PMIC. Watchdog trigger
cause system reset.

Say Y here to include support for the ROHM BD70528 watchdog.
Alternatively say M to compile the driver as a module,
which will be called bd70528_wdt.

source code: