treewide: Apply nonstring attribute to unterminated strings

Applying the attribute silences the following error and allows
compilation with GCC 15.2.

  error: initializer-string for array of 'char' truncates NUL terminator but destination lacks 'nonstring' attribute

Change-Id: I33cf3219f34e297de03f67d3e73058b10930c9f8
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90631
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com>

src/commonlib/bsd/include/commonlib/bsd/metadata_hash.h

@@ -8,7 +8,7 @@
 
 /* This structure is embedded somewhere in the (uncompressed) bootblock. */
 struct metadata_hash_anchor {
-	uint8_t magic[8];
+	uint8_t __nonstring magic[8];
 	struct vb2_hash cbfs_hash;
 	/* NOTE: This is just reserving space. sizeof(struct vb2_hash) may change between
 	   configurations/versions and cannot be relied upon, so the FMAP hash must be placed

src/commonlib/include/commonlib/coreboot_tables.h

@@ -321,7 +321,7 @@ struct lb_gpio {
 #define ACTIVE_HIGH	1
 	uint32_t value;
 #define GPIO_MAX_NAME_LENGTH 16
-	uint8_t name[GPIO_MAX_NAME_LENGTH];
+	uint8_t __nonstring name[GPIO_MAX_NAME_LENGTH];
 };
 
 struct lb_gpios {

src/include/cpu/intel/smm_reloc.h

@@ -28,7 +28,7 @@ struct smm_relocation_params {
 extern struct smm_relocation_params smm_reloc_params;
 
 struct ied_header {
-	char signature[10];
+	char __nonstring signature[10];
 	u32 size;
 	u8 reserved[34];
 } __packed;

src/include/edid.h

@@ -82,8 +82,8 @@ struct edid {
 	u32 bytes_per_line;
 
 	int hdmi_monitor_detected;
-	char ascii_string[EDID_ASCII_STRING_LENGTH + 1];
-	char manufacturer_name[3 + 1];
+	char __nonstring ascii_string[EDID_ASCII_STRING_LENGTH + 1];
+	char __nonstring manufacturer_name[3 + 1];
 };
 
 enum edid_status {

src/northbridge/intel/gm45/gm45.h

@@ -441,7 +441,7 @@ void mb_pre_raminit_setup(sysinfo_t *); /* optional */
 void mb_post_raminit_setup(void); /* optional */
 
 struct blc_pwm_t {
-	char ascii_string[13];
+	char __nonstring ascii_string[13];
 	int pwm_freq; /* In Hz */
 };
 int get_blc_values(const struct blc_pwm_t **entries);