tree: Use <stdio.h> for snprintf

<stdio.h> header is used for input/output operations (such as printf,
scanf, fopen, etc.). Although some input/output functions can manipulate
strings, they do not need to directly include <string.h> because they
are declared independently.

Change-Id: Ibe2a4ff6f68843a6d99cfdfe182cf2dd922802aa
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82665
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/lib/device_tree.c

@@ -8,6 +8,7 @@
 #include <endian.h>
 #include <stdbool.h>
 #include <stdint.h>
+#include <stdio.h>
 #include <string.h>
 #include <stddef.h>
 #include <stdlib.h>

src/lib/fit.c

@@ -12,6 +12,7 @@
 #include <memrange.h>
 #include <fit.h>
 #include <boardid.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <types.h>
 

src/lib/smbios.c

@@ -16,6 +16,7 @@
 #include <device/pci_ids.h>
 #include <device/pci.h>
 #include <drivers/vpd/vpd.h>
+#include <stdio.h>
 #include <stdlib.h>
 
 static u8 smbios_checksum(u8 *p, u32 length)

src/lib/smbios_defaults.c

@@ -3,6 +3,7 @@
 #include <memory_info.h>
 #include <smbios.h>
 #include <stdint.h>
+#include <stdio.h>
 #include <string.h>
 
 /* this function will fill the corresponding locator */

src/lib/ux_locales.c

@@ -4,6 +4,7 @@
 #include <console/console.h>
 #include <security/vboot/misc.h>
 #include <stddef.h>
+#include <stdio.h>
 #include <string.h>
 #include <ux_locales.h>
 #include <vb2_api.h>