coresight: Make language around "activated" sinks consistent

coresight: Make language around "activated" sinks consistent

Activated has the specific meaning of a sink that's selected for use by
the user via sysfs. But comments in some code that's shared by Perf use
the same word, so in those cases change them to just say "selected"
instead. With selected implying either via Perf or "activated" via
sysfs.

coresight_get_enabled_sink() doesn't actually get an enabled sink, it
only gets an activated one, so change that too.

And change the activated variable name to include "sysfs" so it can't
be confused as a general status.

Signed-off-by: James Clark <james.clark@arm.com>
Link: https://lore.kernel.org/r/20240129154050.569566-3-james.clark@arm.com
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>