Unified macro for counter0 and counter1 to set the event in the control
register.  This will be needed by Perf.
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1200/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>