dts: st: h7: fix wwdg1 reg size
dts: st: h7: fix wwdg1 reg size

nice to have real accurate sizing

Signed-off-by: Manojkumar Subramaniam <e5bed78df35c9a68cd0ebc89592def76df34c305@electrolance.com>

galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr