vty: Simplify filler burst settings and improve help and readability.

In the command line options time, filler table/filer burts settings
were a bit difficult to undertand because the number of one-letter
settings was limited. Now, with VTY configuration, there is no reason
to keep it so difficult.

Also, after the previous commit it was no longer posible to enable
random 8-PSK filler bursts. With this patch you can configure all
supported filler bursts in a simple and logical way.

Change-Id: I752eb2c1162d084e8769181f2fcd6c0877663448
diff --git a/CommonLibs/trx_vty.h b/CommonLibs/trx_vty.h
index d939051..d20dd96 100644
--- a/CommonLibs/trx_vty.h
+++ b/CommonLibs/trx_vty.h
@@ -5,6 +5,7 @@
 #include "config_defs.h"
 
 extern struct vty_app_info g_vty_info;
+extern const struct value_string filler_names[];
 
 /* Maximum number of physical RF channels */
 #define TRX_CHAN_MAX 8
@@ -51,9 +52,7 @@
 		unsigned int tx_sps;
 		unsigned int rx_sps;
 		unsigned int rtsc;
-		bool rtsc_set;
 		unsigned int rach_delay;
-		bool rach_delay_set;
 		enum ReferenceType clock_ref;
 		enum FillerType filler;
 		bool multi_arfcn;