r820t: comment out two ancillary tables

As Gcc6.1 warned, those tables are currently unused:
	drivers/media/tuners/r820t.c:349:18: warning: 'r820t_mixer_gain_steps' defined but not used [-Wunused-const-variable=]
	 static const int r820t_mixer_gain_steps[]  = {
	                  ^~~~~~~~~~~~~~~~~~~~~~
	drivers/media/tuners/r820t.c:345:18: warning: 'r820t_lna_gain_steps' defined but not used [-Wunused-const-variable=]
	 static const int r820t_lna_gain_steps[]  = {
	                  ^~~~~~~~~~~~~~~~~~~~

They're actually used only by a routine that it is currently
commented out. So, move those tables to be together with such
code and comment them out.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/tuners/r820t.c

@@ -336,20 +336,6 @@ static int r820t_xtal_capacitor[][2] = {
 	{ 0x10, XTAL_HIGH_CAP_0P },
 };
 
-/*
- * measured with a Racal 6103E GSM test set at 928 MHz with -60 dBm
- * input power, for raw results see:
- *	http://steve-m.de/projects/rtl-sdr/gain_measurement/r820t/
- */
-
-static const int r820t_lna_gain_steps[]  = {
-	0, 9, 13, 40, 38, 13, 31, 22, 26, 31, 26, 14, 19, 5, 35, 13
-};
-
-static const int r820t_mixer_gain_steps[]  = {
-	0, 5, 10, 10, 19, 9, 10, 25, 17, 10, 8, 16, 13, 6, 3, -8
-};
-
 /*
  * I2C read/write code and shadow registers logic
  */
@@ -1216,6 +1202,21 @@ static int r820t_read_gain(struct r820t_priv *priv)
 
 #if 0
 /* FIXME: This routine requires more testing */
+
+/*
+ * measured with a Racal 6103E GSM test set at 928 MHz with -60 dBm
+ * input power, for raw results see:
+ *	http://steve-m.de/projects/rtl-sdr/gain_measurement/r820t/
+ */
+
+static const int r820t_lna_gain_steps[]  = {
+	0, 9, 13, 40, 38, 13, 31, 22, 26, 31, 26, 14, 19, 5, 35, 13
+};
+
+static const int r820t_mixer_gain_steps[]  = {
+	0, 5, 10, 10, 19, 9, 10, 25, 17, 10, 8, 16, 13, 6, 3, -8
+};
+
 static int r820t_set_gain_mode(struct r820t_priv *priv,
 			       bool set_manual_gain,
 			       int gain)