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 <weiyi.huang@gmail.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/include/asm/io.h

@@ -12,7 +12,6 @@
 #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

@@ -39,7 +39,6 @@
 #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

@@ -32,7 +32,6 @@
 #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

@@ -37,7 +37,6 @@
 #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

@@ -29,9 +29,7 @@
 #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>