Typedefs starting with `l' in osfmk/kern

• ledger_data_t osfmk/kern/ledger.h:44
• ledger_t osfmk/kern/kern_types.h:76
• Lock_Set osfmk/kern/sync_lock.h:77
• lock_set_t osfmk/kern/kern_types.h:75
• lock_t osfmk/kern/lock.h:215