[media] lgdt3306a: one bit fields should be unsigned

Fix two smatch warnings:
	drivers/media/dvb-frontends/lgdt3306a.h:53:28: error: dubious one-bit signed bitfield
	drivers/media/dvb-frontends/lgdt3306a.h:56:33: error: dubious one-bit signed bitfield
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/lgdt3306a.h

@@ -50,10 +50,10 @@ struct lgdt3306a_config {
 	u16 vsb_if_khz;
 
 	/* disable i2c repeater - 0:repeater enabled 1:repeater disabled */
-	int deny_i2c_rptr:1;
+	unsigned int deny_i2c_rptr:1;
 
 	/* spectral inversion - 0:disabled 1:enabled */
-	int spectral_inversion:1;
+	unsigned int spectral_inversion:1;
 
 	enum lgdt3306a_mpeg_mode mpeg_mode;
 	enum lgdt3306a_tp_clock_edge tpclk_edge;