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.h

@@ -501,7 +501,6 @@ void exec_context_revert_tty(ExecContext *c);
 
 int exec_context_get_clean_directories(ExecContext *c, char **prefix, ExecCleanMask mask, char ***ret);
 int exec_context_get_clean_mask(ExecContext *c, ExecCleanMask *ret);
-int exec_context_add_default_dependencies(Unit *u, const ExecContext *c);
 
 void exec_status_start(ExecStatus *s, pid_t pid);
 void exec_status_exit(ExecStatus *s, const ExecContext *context, pid_t pid, int code, int status);