microblaze: remove duplicated #include's

Remove duplicated #include's in
arch/microblaze/include/asm/io.h
arch/microblaze/kernel/prom.c
arch/microblaze/kernel/ptrace.c
arch/microblaze/kernel/signal.c
arch/microblaze/kernel/sys_microblaze.c

Signed-off-by: Huang Weiyi <[e-mail]>
Signed-off-by: Michal Simek <[e-mail]>

arch/microblaze/include/asm/io.h

···
 #include <asm/byteorder.h>
 #include <asm/page.h>
 #include <linux/types.h>
-#include <asm/page.h>
 
 #define IO_SPACE_LIMIT (0xFFFFFFFF)
 

arch/microblaze/kernel/prom.c

···
 #include <asm/system.h>
 #include <asm/mmu.h>
 #include <asm/pgtable.h>
-#include <linux/pci.h>
 #include <asm/sections.h>
 #include <asm/pci-bridge.h>
 

arch/microblaze/kernel/ptrace.c

···
 #include <linux/signal.h>
 
 #include <linux/errno.h>
-#include <linux/ptrace.h>
 #include <asm/processor.h>
 #include <linux/uaccess.h>
 #include <asm/asm-offsets.h>

arch/microblaze/kernel/signal.c

···
 #include <linux/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
-#include <linux/signal.h>
 #include <linux/syscalls.h>
 #include <asm/cacheflush.h>
 #include <asm/syscalls.h>

arch/microblaze/kernel/sys_microblaze.c

···
 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/fs.h>
-#include <linux/ipc.h>
 #include <linux/semaphore.h>
-#include <linux/syscalls.h>
 #include <linux/uaccess.h>
 #include <linux/unistd.h>