tests: interrupt: add some nop operations in trigger_irq function.
tests: interrupt: add some nop operations in trigger_irq function.

On X86 platforms, the interrupt trigger method has been changed
from using INT command to using APIC IPI, we need to make sure
the IPI interrupt is handled before do our check, so add some
nop operations.

Signed-off-by: Chen Peng1 <a9104ed43ee1e05962395401b47b879b137cfacf@intel.com>

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