board: arc: hsdk: Enable SMP
board: arc: hsdk: Enable SMP

With latest SDK release v0.11.3 basic SMP support for HSDK
board was introduced in OpenOCD. Lets enable smp in openocd.cfg,
so using west we would be able to run Zephyr on all 4 cores.

Signed-off-by: Evgeniy Didin <5435af8d1d1b65d63b9ec68a39e143f1f5881d59@synopsys.com>

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