microblaze: Fix size of __kernel_mode_t to short

This patches solve problem with inconsistency between
kernel and glibc

Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/include/asm/posix_types.h

@@ -16,7 +16,7 @@
  */
 
 typedef unsigned long	__kernel_ino_t;
-typedef unsigned int	__kernel_mode_t;
+typedef unsigned short	__kernel_mode_t;
 typedef unsigned int	__kernel_nlink_t;
 typedef long		__kernel_off_t;
 typedef int		__kernel_pid_t;