Perf: arm64: enable cti workaround

The CTI workaround is needed by perf-events, and is
usually enabled by the EDAC driver. Also enable it
from perf-events in case the EDAC driver is not
configured.

Change-Id: Ica53cb045da32ee401800446ee189bda8af3bf33
Signed-off-by: Neil Leeder <nleeder@codeaurora.org>