Add TDWR channels to channels.tsv.

They've allowed as DFS channels again in the US, and wireless
chipsets have started using them.

Change-Id: Ic79b530faa34689368718681e2eabdb2a799cbc4
diff --git a/wifitables/channels.tsv b/wifitables/channels.tsv
index 3929127..06462f8 100644
--- a/wifitables/channels.tsv
+++ b/wifitables/channels.tsv
@@ -23,6 +23,9 @@
 108	5540
 112	5560
 116	5580
+120	5600
+124	5620
+128	5640
 132	5660
 136	5680
 140	5700
@@ -30,4 +33,4 @@
 153	5765
 157	5785
 161	5805
-165	5825
\ No newline at end of file
+165	5825