advfs: Remove unused real_mutex_{,un}lock_io
advfs: Remove unused macros mutex_{,un}lock_io
advfs: Remove remnant usage of the deleted macro MS_DBG_ASSERT
advfs: Remove unused lk_locked()
advfs: remove extra debugging from cond_wait, cond_signal and cond_broadcast
advfs: Remove extra debugging from lk_signal
advfs: Remove extra debugging for lk_set_state, lk_wait_for, lk_wait_for2, lk_wait_while