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/soc/intel/common/block/acpi/acpi.c

@@ -13,6 +13,7 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */
+
 #include <arch/acpigen.h>
 #include <arch/ioapic.h>
 #include <arch/smp/mpspec.h>
@@ -30,6 +31,7 @@
 #include <soc/iomap.h>
 #include <soc/nvs.h>
 #include <soc/pm.h>
+#include <string.h>
 
 __attribute__((weak)) unsigned long acpi_fill_mcfg(unsigned long current)
 {

src/soc/intel/common/block/fast_spi/fast_spi.c

@@ -26,7 +26,6 @@
 #include <spi_flash.h>
 #include <spi-generic.h>
 #include <stdlib.h>
-#include <string.h>
 
 /*
  * Get the FAST_SPIBAR.

src/soc/intel/common/block/uart/uart.c

@@ -27,7 +27,6 @@
 #include <soc/pci_devs.h>
 #include <soc/iomap.h>
 #include <soc/nvs.h>
-#include <string.h>
 
 #define UART_PCI_ENABLE	(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER)
 #define UART_CONSOLE_INVALID_INDEX	0xFF

src/soc/intel/common/mma.c

@@ -18,6 +18,7 @@
 #include <cbmem.h>
 #include <console/console.h>
 #include <soc/intel/common/mma.h>
+#include <string.h>
 
 #define MMA_TEST_METADATA_FILENAME	"mma_test_metadata.bin"
 #define MMA_TEST_NAME_TAG		"MMA_TEST_NAME"

src/soc/intel/common/pch/lockdown/lockdown.c

@@ -21,7 +21,6 @@
 #include <soc/pci_devs.h>
 #include <soc/pcr_ids.h>
 #include <soc/soc_chip.h>
-#include <string.h>
 
 #define PCR_DMI_GCS		0x274C
 #define PCR_DMI_GCS_BILD	(1 << 0)