tracing/filter: Move OR and AND logic out of fn() method

The ops OR and AND act different from the other ops, as they
are the only ones to take other ops as their arguements.
These ops als change the logic of the filter_match_preds.

By removing the OR and AND fn's we can also remove the val1 and val2
that is passed to all other fn's and are unused.

Cc: Tom Zanussi <tzanussi@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>