UPSTREAM: perf/arm-cmn: Hide XP PUB events for CMN-600

CMN-600 doesn't have XP events for the PUB channel, but we missed
the appropriate check to avoid exposing them.

Bug: 254441685
Fixes: 60d15040 ("perf/arm-cmn: Support new IP features")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/4c108d39a0513def63acccf09ab52b328f242aeb.1645727871.git.robin.murphy@arm.com


Signed-off-by: Will Deacon <will@kernel.org>
(cherry picked from commit 205295c7)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I04bbedaed680204d2d8590c2f77aded18e896f53