qm1d1b0004: fix a warning about an unused default_cfg var

As warned by gcc:

	drivers/media/tuners/qm1d1b0004.c:62:39: warning: 'default_cfg' defined but not used [-Wunused-const-variable=]
	 static const struct qm1d1b0004_config default_cfg = {
	                                       ^~~~~~~~~~~

This var is currently unused. So, comment it out.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/tuners/qm1d1b0004.c

@@ -59,10 +59,12 @@
 #define QM1D1B0004_XTL_FREQ 4000
 #define QM1D1B0004_LPF_FALLBACK 30000
 
+#if 0 /* Currently unused */
 static const struct qm1d1b0004_config default_cfg = {
 	.lpf_freq = QM1D1B0004_CFG_LPF_DFLT,
 	.half_step = false,
 };
+#endif
 
 struct qm1d1b0004_state {
 	struct qm1d1b0004_config cfg;