coresight: etm4x: Ensure default perf settings filter user/kernel

coresight: etm4x: Ensure default perf settings filter user/kernel

Moving from using an address filter to trace the default "all addresses"
range to no filtering to acheive the same result, has caused the perf
filtering of kernel/user address spaces from not working unless an
explicit address filter was used.

This is due to the original code using a side-effect of the address
filtering rather than setting the global TRCVICTLR exception level
filtering.

The use of the mode sysfs file is also similarly affected.

A helper function is added to fix both instances.

Fixes: ae2041510d5d ("coresight: etmv4: Update default filter and initialisation")
Reported-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200916191737.4001561-8-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>