soc: nrf: Disable DWT NULL pointer detection by default
soc: nrf: Disable DWT NULL pointer detection by default

Having DWT-based NULL-pointer detection enabled by default trips a lot
of users since it will make any debugging fail when enabled. Disable it
by default and let users enable it if they desire to.

Fixes #39216.

Signed-off-by: Carles Cufi <853081dc8dca4fe6a7e3c984752718b5db36e060@nordicsemi.no>

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