default or selected kernelversion does not have config value CONFIG_ORION5X_WATCHDOG.
Result is shown for kernelversion 5.3.7

Orion5x watchdog

modulename: orion5x_wdt.ko


Linux Kernel Configuration
└─>Device Drivers
└─>Watchdog Timer Support
└─>Orion5x watchdog
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
Say Y here if to include support for the watchdog timer
in the Orion5x ARM SoCs.
To compile this driver as a module, choose M here: the
module will be called orion5x_wdt.

source code: