blktrace: Use blk_trace_bio_get_cgid inside blk_add_trace_bio

We always pass in blk_trace_bio_get_cgid(q, bio) to blk_add_trace_bio().
Since both are readily available in the function already, kill the
argument.

Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>

Rewrote commit message.

Signed-off-by: Jens Axboe <axboe@kernel.dk>