ARM: imx5: remove mx51.h and mx53.h

Now all the macros in mx51.h and mx53.h are used nowhere, so remove
them.
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

arch/arm/mach-imx/hardware.h

@@ -105,8 +105,6 @@
 
 #include "mxc.h"
 
-#include "mx51.h"
-#include "mx53.h"
 #include "mx3x.h"
 #include "mx31.h"
 #include "mx35.h"

arch/arm/mach-imx/mach-imx51.c

@@ -19,7 +19,6 @@
 
 #include "common.h"
 #include "hardware.h"
-#include "mx51.h"
 
 static void __init imx51_init_early(void)
 {

arch/arm/mach-imx/mach-imx53.c

@@ -22,7 +22,6 @@
 
 #include "common.h"
 #include "hardware.h"
-#include "mx53.h"
 
 static void __init imx53_init_early(void)
 {