drivers/perf: Simplify EVENT ATTR macro in SMMU PMU driver

Use common macro PMU_EVENT_ATTR_ID to simplify SMMU_EVENT_ATTR

Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Qi Liu <liuqi115@huawei.com>
Link: https://lore.kernel.org/r/1623220863-58233-3-git-send-email-liuqi115@huawei.com


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