defconfig: enable coresight support for stm and cti on 8994 perf config

Enable CoreSight drivers required to support STM tracing to
various sinks along with CTI driver. Also disable CTI save and
restore support to allow for low overhead CTI usage at the cost
of breaking cpu CTI support.

This will allow software instrumented trace and low overhead
cross triggering to be used on 8994 perf defconfig.

Change-Id: Id443338ad1d6cc6cf682a9d0b94e5afa0fdb8402
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>