ARC: perf: cap the number of counters to hardware max of 32

The number of counters in PCT can never be more than 32 (while
countable conditions could be 100+) for both ARCompact and ARCv2

And while at it update copyright dates.

Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>