arch-arm: Support PMU evens in the 0x4000-0x4040 range

ARMv8.1 added a second architected event range, 0x4000-0x4040. Events
in this range are discovered using the high word of PMCEID{0,1}_EL0

Change-Id: I4cd01264230e5da4c841268a7cf3e6bd307c7180
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/3960
3 files changed