Platform: Nordic: Fix IRQ test config

It might be a mistake brought by
I6ec4eb80363cdb6c62b7e1c8391a8c9265f6e477.

Change-Id: I5d5bdfddc251da5a369e407c754da22e9f532cf5
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
1 file changed