src: Use 'include <string.h>' when appropriate

Drop 'include <string.h>' when it is not used and
add it when it is missing.
Also extra lines removed, or added just before local includes.

Change-Id: Iccac4dbaa2dd4144fc347af36ecfc9747da3de20
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31966
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/superio/smsc/dme1737/superio.c

@@ -20,7 +20,6 @@
 #include <device/pnp.h>
 #include <superio/conf_mode.h>
 #include <device/smbus.h>
-#include <string.h>
 #include <pc80/keyboard.h>
 #include <stdlib.h>
 #include "dme1737.h"

src/superio/smsc/kbc1100/superio.c

@@ -19,7 +19,6 @@
 #include <device/pnp.h>
 #include <superio/conf_mode.h>
 #include <device/smbus.h>
-#include <string.h>
 #include <pc80/keyboard.h>
 #include <stdlib.h>
 #include "kbc1100.h"

src/superio/smsc/lpc47b272/superio.c

@@ -23,7 +23,6 @@
 #include <device/pnp.h>
 #include <superio/conf_mode.h>
 #include <device/smbus.h>
-#include <string.h>
 #include <pc80/keyboard.h>
 #include <stdlib.h>
 #include "lpc47b272.h"

src/superio/smsc/lpc47b397/superio.c

@@ -21,7 +21,6 @@
 #include <superio/conf_mode.h>
 #include <console/console.h>
 #include <device/smbus.h>
-#include <string.h>
 #include <pc80/keyboard.h>
 #include <stdlib.h>
 #include "lpc47b397.h"

src/superio/smsc/lpc47m10x/superio.c

@@ -22,7 +22,6 @@
 #include <device/pnp.h>
 #include <superio/conf_mode.h>
 #include <device/smbus.h>
-#include <string.h>
 #include <pc80/keyboard.h>
 #include <stdlib.h>
 #include "lpc47m10x.h"

src/superio/smsc/lpc47m15x/superio.c

@@ -19,7 +19,6 @@
 #include <device/pnp.h>
 #include <superio/conf_mode.h>
 #include <device/smbus.h>
-#include <string.h>
 #include <pc80/keyboard.h>
 #include <stdlib.h>
 #include "lpc47m15x.h"

src/superio/smsc/lpc47n217/superio.c

@@ -24,7 +24,6 @@
 #include <device/pnp.h>
 #include <console/console.h>
 #include <device/smbus.h>
-#include <string.h>
 #include <assert.h>
 #include <stdlib.h>
 #include "lpc47n217.h"

src/superio/smsc/lpc47n227/superio.c

@@ -20,7 +20,6 @@
 #include <device/pnp.h>
 #include <console/console.h>
 #include <device/smbus.h>
-#include <string.h>
 #include <assert.h>
 #include <stdlib.h>
 #include <pc80/keyboard.h>

src/superio/smsc/mec1308/superio.c

@@ -19,7 +19,6 @@
 #include <device/pnp.h>
 #include <superio/conf_mode.h>
 #include <device/smbus.h>
-#include <string.h>
 #include <pc80/keyboard.h>
 #include <stdlib.h>
 #include "mec1308.h"