Revert "pid1: order units using TTYVHangup= after vconsole setup"

This reverts commit e019ea738d.

In the new approach, a lock on /dev/console will be used. This lock will solve
the issue for services which run in early boot. Services which run later are
ordered after sysinit.target, so they'll run much later anyway so this
automatic dependency is not useful. Let's remove it again to make the code
simpler.

src/core/execute.c

@@ -7219,16 +7219,6 @@ bool exec_context_has_encrypted_credentials(ExecContext *c) {
         return false;
 }
 
-int exec_context_add_default_dependencies(Unit *u, const ExecContext *c) {
-        assert(u);
-        assert(u->default_dependencies);
-
-        if (c && exec_context_needs_term(c))
-                return unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_VCONSOLE_SETUP_SERVICE,
-                                                   /* add_reference= */ true, UNIT_DEPENDENCY_DEFAULT);
-        return 0;
-}
-
 void exec_status_start(ExecStatus *s, pid_t pid) {
         assert(s);