Reserve and ignore the a new module metadata type MDT_PNP_INFO for

associating an optional PNP hint table with this module. In the
future, when these are added, these changes will silently ignore the
new type they would otherwise warn about. It will always be safe to
ignore this data. Get this into the builds today for some future
proofing.

MFC After: 3 days

sys/boot/common/load_elf_obj.c

@@ -416,6 +416,7 @@ __elfN(obj_parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef)
 			modcnt++;
 			break;
 		case MDT_MODULE:
+		case MDT_PNP_INFO:
 			break;
 		default:
 			printf("unknown type %d\n", md.md_type);

sys/sys/module.h

@@ -35,6 +35,7 @@
 #define	MDT_DEPEND	1		/* argument is a module name */
 #define	MDT_MODULE	2		/* module declaration */
 #define	MDT_VERSION	3		/* module version(s) */
+#define	MDT_PNP_INFO	4		/* Plug and play hints record */
 
 #define	MDT_STRUCT_VERSION	1	/* version of metadata structure */
 #define	MDT_SETNAME	"modmetadata_set"

usr.sbin/kldxref/kldxref.c

@@ -172,6 +172,10 @@ parse_entry(struct mod_metadata *md, const char *cval,
 			record_string(kldname);
 		}
 		break;
+	case MDT_PNP_INFO:
+		if (dflag) {
+			printf("  pnp info for bus %s\n", cval);
+		}
 	default:
 		warnx("unknown metadata record %d in file %s", md->md_type, kldname);
 	}