platform: cznic: turris-omnia-mcu: Depend on WATCHDOG

Add depend on WATCHDOG, otherwise modpost fails with
  ERROR: modpost: "watchdog_init_timeout" [drivers/platform/cznic/turris-omnia-mcu.ko] undefined!
  ERROR: modpost: "devm_watchdog_register_device" [drivers/platform/cznic/turris-omnia-mcu.ko] undefined!

Fixes: ab89fb5 ("platform: cznic: turris-omnia-mcu: Add support for MCU watchdog")
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Marek Behún <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>

Author: elkablo

drivers/platform/cznic/Kconfig

@@ -17,6 +17,7 @@ config TURRIS_OMNIA_MCU
 	depends on MACH_ARMADA_38X || COMPILE_TEST
 	depends on I2C
 	depends on OF
+	depends on WATCHDOG
 	select GPIOLIB
 	select GPIOLIB_IRQCHIP
 	select HW_RANDOM