boards: ARC: nsim: simplify runner setup & pass MP_NUM_CPUS unconditionally
boards: ARC: nsim: simplify runner setup & pass MP_NUM_CPUS unconditionally

Do not check for exact SoC to pass '--cores=${CONFIG_MP_NUM_CPUS}'
options to runners an pass it unconditionally instead.

That preventis from issues when adding new SoC/board.

Signed-off-by: Eugeniy Paltsev <ec089b543c2604b626d7ce60c03e4d074ed102c7@synopsys.com>
Signed-off-by: Evgeniy Paltsev <7de4ab8b01334d64e4e84734c688a8a936513edc@gmail.com>

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