perf: arm_cspmu: Set irq affinitiy only if overflow interrupt is used

Don't try to set irq affinity if PMU doesn't have an overflow interrupt.

Fixes: e37dfd65 ("perf: arm_cspmu: Add support for ARM CoreSight PMU driver")
Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20230608203742.3503486-1-ilkka@os.amperecomputing.com


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