lib/posix: Port wait_q usage to new API

The pthread mutex changes went in with an adaptation to build with the
new wait queue API, but they did it by using the old dlist hooks
directly through typecasting and union assignment.  That... is sort of
the opposite of the intent to having the new API be abstracted.  The
pthread code worked, but failed once wait queues (on x86) stopped
being dlists.

Simple fix once I saw the problem, anyway.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
diff --git a/include/posix/pthread.h b/include/posix/pthread.h
index 947d585..ecc3ce7 100644
--- a/include/posix/pthread.h
+++ b/include/posix/pthread.h
@@ -157,7 +157,7 @@
 		__in_section(_k_mutex, static, name) = \
 	{ \
 		.lock_count = 0, \
-		.wait_q = {SYS_DLIST_STATIC_INIT((sys_dlist_t *)&name.wait_q)}, \
+		.wait_q = _WAIT_Q_INIT(&name.wait_q),	\
 		.owner = NULL, \
 	}
 
diff --git a/lib/posix/pthread_mutex.c b/lib/posix/pthread_mutex.c
index 4ae0857..e951672 100644
--- a/lib/posix/pthread_mutex.c
+++ b/lib/posix/pthread_mutex.c
@@ -95,7 +95,7 @@
 
 	m->type = mattr->type;
 
-	sys_dlist_init((sys_dlist_t *)&m->wait_q);
+	_waitq_init(&m->wait_q);
 
 	return 0;
 }