ASoC: rcar: some dubious one-bit signed bitfields

Because these are signed they can either be 0 or -1 instead of 0 and 1
as intended.  It doesn't cause a problem from what I can see, but it's
dangerous and Sparse complains:

	sound/soc/sh/rcar/rsnd.h:177:25:
		error: dubious one-bit signed bitfield

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/sh/rcar/rsnd.h

@@ -174,11 +174,11 @@ struct rsnd_dai {
 	struct rsnd_dai_stream playback;
 	struct rsnd_dai_stream capture;
 
-	int clk_master:1;
+	unsigned int clk_master:1;
-	int bit_clk_inv:1;
+	unsigned int bit_clk_inv:1;
-	int frm_clk_inv:1;
+	unsigned int frm_clk_inv:1;
-	int sys_delay:1;
+	unsigned int sys_delay:1;
-	int data_alignment:1;
+	unsigned int data_alignment:1;
 };
 
 #define rsnd_dai_nr(priv) ((priv)->dai_nr)