Changes the mutex API so that the timeout parameter must be specified
when invoking task_mutex_lock() thereby obsoleting the following APIs:
task_mutex_lock_wait()
task_mutex_lock_wait_timeout()
_task_mutex_lock()
Change-Id: I15d4bddbdc2707b3cbdab672498170da1c47b8db
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>