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/cpu/intel/haswell/haswell_init.c

@@ -17,7 +17,6 @@
 
 #include <console/console.h>
 #include <device/device.h>
-#include <string.h>
 #include <arch/acpi.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/mtrr.h>

src/cpu/intel/haswell/romstage.c

@@ -14,7 +14,6 @@
  */
 
 #include <stdint.h>
-#include <string.h>
 #include <console/console.h>
 #include <arch/cpu.h>
 #include <cf9_reset.h>

src/cpu/intel/model_1067x/model_1067x_init.c

@@ -17,7 +17,6 @@
 
 #include <console/console.h>
 #include <device/device.h>
-#include <string.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/msr.h>
 #include <cpu/x86/mp.h>

src/cpu/intel/model_106cx/model_106cx_init.c

@@ -15,7 +15,6 @@
 
 #include <console/console.h>
 #include <device/device.h>
-#include <string.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/msr.h>
 #include <cpu/x86/lapic.h>

src/cpu/intel/model_2065x/model_2065x_init.c

@@ -17,7 +17,6 @@
 
 #include <console/console.h>
 #include <device/device.h>
-#include <string.h>
 #include <arch/acpi.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/mtrr.h>

src/cpu/intel/model_206ax/model_206ax_init.c

@@ -18,7 +18,6 @@
 #include <assert.h>
 #include <console/console.h>
 #include <device/device.h>
-#include <string.h>
 #include <arch/acpi.h>
 #include <arch/cpu.h>
 #include <cpu/cpu.h>

src/cpu/intel/model_6ex/model_6ex_init.c

@@ -16,7 +16,6 @@
 
 #include <console/console.h>
 #include <device/device.h>
-#include <string.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/msr.h>
 #include <cpu/x86/lapic.h>

src/cpu/intel/model_6fx/model_6fx_init.c

@@ -16,7 +16,6 @@
 
 #include <console/console.h>
 #include <device/device.h>
-#include <string.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/msr.h>
 #include <cpu/x86/lapic.h>

src/cpu/intel/speedstep/acpi.c

@@ -23,7 +23,6 @@
 #include <cpu/x86/msr.h>
 #include <cpu/intel/speedstep.h>
 #include <device/device.h>
-#include <string.h>
 
 static int determine_total_number_of_cores(void)
 {