MIPS: Oprofile: Loongson: Cleanup the comments

Removes some out-of-date comments and empty lines.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1204/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>