MIPS: SGI-IP27: Remove not used includes and comment in ip27-timer.c

After commit 0ce5ebd2 ("mfd: ioc3: Add driver for SGI IOC3 chip"),
the related includes and comment about ioc3 are not used any more in
ip27-timer.c, remove them.
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

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

@@ -21,7 +21,6 @@
 #include <asm/time.h>
 #include <asm/pgtable.h>
 #include <asm/sgialib.h>
-#include <asm/sn/ioc3.h>
 #include <asm/sn/klconfig.h>
 #include <asm/sn/arch.h>
 #include <asm/sn/addrs.h>
@@ -31,10 +30,6 @@
 
 #define TICK_SIZE (tick_nsec / 1000)
 
-/* Includes for ioc3_init().  */
-#include <asm/sn/types.h>
-#include <asm/pci/bridge.h>
-
 static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
 {
 	unsigned int cpu = smp_processor_id();