uml: remove unused header

From: Adrian Bunk <bunk@kernel.org>

This patch removes the unused and broken (the normal asm/keyboard.h
files no longer exists) include/asm-um/keyboard.h
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/asm-um/keyboard.h

-#ifndef __UM_KEYBOARD_H
-#define __UM_KEYBOARD_H
-
-#include "asm/arch/keyboard.h"
-
-#endif