perf/arm-ni: Set initial IRQ affinity

While we do request our IRQs with the right flags to stop their affinity
changing unexpectedly, we forgot to actually set it to start with. Oops.

Cc: stable@vger.kernel.org
Fixes: 4d5a7680 ("perf: Add driver for Arm NI-700 interconnect PMU")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Shouping Wang <allen.wang@hj-micro.com>
Link: https://lore.kernel.org/r/614ced9149ee8324e58930862bd82cbf46228d27.1747149165.git.robin.murphy@arm.com


Signed-off-by: Will Deacon <will@kernel.org>