Remove channels which are no longer in use in us-bcast (Backport of 2080ca3)

This removes channels which are no longer allocated to OTA in us-bcast.

OKed by danielk and sphery. Thanks goes to majortom from bringing this up.

Author: Nicolas Riendeau

mythtv/libs/libmythtv/frequencies.c

@@ -79,21 +79,6 @@ static struct CHANLIST ntsc_bcast[] = {
     { "67",	789250 },
     { "68",	795250 },
     { "69",	801250 },
- 
-    { "70",	807250 },
-    { "71",	813250 },
-    { "72",	819250 },
-    { "73",	825250 },
-    { "74",	831250 },
-    { "75",	837250 },
-    { "76",	843250 },
-    { "77",	849250 },
-    { "78",	855250 },
-    { "79",	861250 },
-    { "80",	867250 },
-    { "81",	873250 },
-    { "82",	879250 },
-    { "83",	885250 },
 };
 
 /* US cable */

mythtv/libs/libmythtv/frequencytables.cpp

@@ -513,10 +513,6 @@ static void init_freq_tables(freq_table_map_t &fmap)
     fmap["atsc_vsb8_us3"] = new FrequencyTable(
         "ATSC Channel %1", 14, 473000000, 803000000, 6000000,
         DTVModulation::kModulation8VSB);
-    // UHF 70-83
-    fmap["atsc_vsb8_us4"] = new FrequencyTable(
-        "ATSC Channel %1", 70, 809000000, 887000000, 6000000,
-        DTVModulation::kModulation8VSB);
 #endif // !DEBUG_DVB_OFFSETS
 
     QString modStr[] = { "vsb8",  "qam256",   "qam128",   "qam64",   };