bsc: Remove the handling of the RTP option from the switch/case stmt

The 'P' code was not present in the getopt call anyway.
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_main.c b/openbsc/src/osmo-bsc/osmo_bsc_main.c
index 5aad974..51e5077 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_main.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_main.c
@@ -115,9 +115,6 @@
 		case 'T':
 			log_set_print_timestamp(stderr_target, 1);
 			break;
-		case 'P':
-			ipacc_rtp_direct = 0;
-			break;
 		case 'e':
 			log_set_log_level(stderr_target, atoi(optarg));
 			break;