checkpatch: Complain about unexpected uses of RCU Tasks Trace

RCU Tasks Trace is quite specialized, having been created specifically
for sleepable BPF programs.  Because it allows general blocking within
readers, any new use of RCU Tasks Trace must take current use cases into
account.  Therefore, update checkpatch.pl to complain about use of any of
the RCU Tasks Trace API members outside of BPF and outside of RCU itself.

[ paulmck: Apply Joe Perches feedback. ]

Cc: Andy Whitcroft <[email protected]> (maintainer:CHECKPATCH)
Cc: Joe Perches <[email protected]> (maintainer:CHECKPATCH)
Cc: Dwaipayan Ray <[email protected]> (reviewer:CHECKPATCH)
Cc: Lukas Bulwahn <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: John Fastabend <[email protected]>
Cc: <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

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