Test: Modify IRQ test flow for tool

Modify the flow of the IRQ test case so it can be executed with the IRQ
testing tool.

Change-Id: Ibc646baf2b979a0c054cc969b5a061e3c0e79081
Signed-off-by: Mate Toth-Pal <mate.toth-pal@arm.com>
4 files changed