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/commonlib/storage/pci_sdhci.c

@@ -22,8 +22,10 @@
 #include <commonlib/sdhci.h>
 #include <device/pci.h>
 #include <device/pci_ops.h>
-#include "sd_mmc.h"
 #include <stdint.h>
+#include <string.h>
+
+#include "sd_mmc.h"
 #include "storage.h"
 
 /* Initialize an SDHCI port */

src/commonlib/storage/sd.c

@@ -26,7 +26,6 @@
 #include <endian.h>
 #include "sd_mmc.h"
 #include "storage.h"
-#include <string.h>
 #include <timer.h>
 
 int sd_send_if_cond(struct storage_media *media)

src/commonlib/storage/sdhci.c

@@ -27,7 +27,6 @@
 #include "sdhci.h"
 #include "sd_mmc.h"
 #include "storage.h"
-#include <string.h>
 #include <timer.h>
 #include <commonlib/stdlib.h>
 

src/commonlib/storage/storage_write.c

@@ -19,9 +19,10 @@
  * GNU General Public License for more details.
  */
 
+#include <stdlib.h>
+
 #include "sd_mmc.h"
 #include "storage.h"
-#include <string.h>
 
 static uint32_t storage_write(struct storage_media *media, uint32_t start,
 	uint64_t block_count, const void *src)