Revert "ortp: make sure the ortp scheduler is started"

We discovered that enabling the scheduler caused a segfault on the
ARM build of osmo-bts. So we have to revert the following two changes:
Change-Id I3a63c23f5ede47773b6a249a48ecebd5d3b45ace
Change-Id I4b8f0349d5503bbe53745cc8903beb26f149f219

This reverts commit 7632278ea36c25eaa0d8e35fa0ee102ec05dc802.

Change-Id: Ie375b9eb0dc8ec4f8d4ca12940a7bc5dfc1f6235
Related: OS#3299
diff --git a/src/trau/osmo_ortp.c b/src/trau/osmo_ortp.c
index 13e2478..cc8e473 100644
--- a/src/trau/osmo_ortp.c
+++ b/src/trau/osmo_ortp.c
@@ -291,7 +291,6 @@
 
 	ortp_set_log_handler(my_ortp_logfn);
 	create_payload_types();
-	ortp_scheduler_init();
 }
 
 /*! \brief Set Osmocom RTP socket parameters