MIPS: SGI-IP27: Remove duplicated include in ip27-timer.c

After commit 9d0aaf98 ("MIPS: SGI-IP27: Move all shared IP27
declarations to ip27-common.h"), ip27-common.h is included more
than once in ip27-timer.c, remove it.
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/sgi-ip27/ip27-timer.c

@@ -35,8 +35,6 @@
 #include <asm/sn/types.h>
 #include <asm/pci/bridge.h>
 
-#include "ip27-common.h"
-
 static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
 {
 	unsigned int cpu = smp_processor_id();