ARM: pxa: moved pxa27x_keypad.h to platform pxa directory

mach-mmp utilizes pxa27x_keypad code so we need to move header to
platform pxa directory.

Signed-off-by: Mark F. Brown <mark.brown314@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
diff --git a/drivers/input/keyboard/pxa27x_keypad.c b/drivers/input/keyboard/pxa27x_keypad.c
index f32404f..731bd88 100644
--- a/drivers/input/keyboard/pxa27x_keypad.c
+++ b/drivers/input/keyboard/pxa27x_keypad.c
@@ -32,7 +32,7 @@
 #include <asm/mach/map.h>
 
 #include <mach/hardware.h>
-#include <mach/pxa27x_keypad.h>
+#include <plat/pxa27x_keypad.h>
 /*
  * Keypad Controller registers
  */