perf tools: Add missing newline at the end of header file

Add missing newline at the end of file parse-sublevel-options.h.

Thus removing relevant warning reported by checkpatch.

Signed-off-by: Nghia Le <[e-mail]>
Reviewed-by: Lukas Bulwahn <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http //lore.kernel.org/lkml/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>