FTM: Remove unused variable writes

These default values are overridden in the following switch statement.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
diff --git a/ftm.c b/ftm.c
index 6389ac7..2685fee 100644
--- a/ftm.c
+++ b/ftm.c
@@ -73,12 +73,8 @@
 
 	/* Using this following defaults:
 	 * default value of band 1
-	 * channel 36
-	 * center frequency of 5210
 	 */
 	band = 1;
-	primary_ch = 36;
-	center_freq = 5210;
 
 #define FMT_BW_NO_PREF 0
 #define FMT_BW_HT_20 9