udev: move ResolveNameTiming definition and parsers to udev-util.h

Follow-up for c4d44cba4d. No functional change,
but the parser is moved to libsystemd-shared.so.

src/shared/udev-util.c

@@ -7,10 +7,19 @@
 #include "fileio.h"
 #include "log.h"
 #include "parse-util.h"
+#include "string-table.h"
 #include "string-util.h"
 #include "udev-util.h"
 #include "udev.h"
 
+static const char* const resolve_name_timing_table[_RESOLVE_NAME_TIMING_MAX] = {
+        [RESOLVE_NAME_NEVER] = "never",
+        [RESOLVE_NAME_LATE] = "late",
+        [RESOLVE_NAME_EARLY] = "early",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(resolve_name_timing, ResolveNameTiming);
+
 int udev_parse_config_full(
                 unsigned *ret_children_max,
                 usec_t *ret_exec_delay_usec,

src/shared/udev-util.h

@@ -3,6 +3,17 @@
 
 #include "time-util.h"
 
+typedef enum ResolveNameTiming {
+        RESOLVE_NAME_NEVER,
+        RESOLVE_NAME_LATE,
+        RESOLVE_NAME_EARLY,
+        _RESOLVE_NAME_TIMING_MAX,
+        _RESOLVE_NAME_TIMING_INVALID = -1,
+} ResolveNameTiming;
+
+ResolveNameTiming resolve_name_timing_from_string(const char *s) _pure_;
+const char *resolve_name_timing_to_string(ResolveNameTiming i) _const_;
+
 int udev_parse_config_full(
                 unsigned *ret_children_max,
                 usec_t *ret_exec_delay_usec,