test: error_hook: fix trigger_fault_access for em_starterkit board
test: error_hook: fix trigger_fault_access for em_starterkit board

em_starterkit has ICCM at 0x0 address, access to 0x0
address doesn't generate any exception, so we access
to 0xFFFFFFFF address instead to trigger exception.

Signed-off-by: Watson Zeng <bb6a45ebfbb8932a11537002b062f5218879c562@synopsys.com>

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