ASoC: add Renesas R-Car ADG feature

Renesas R-Car series sound circuit consists of SSI and its peripheral.
But this peripheral circuit is different between
R-Car Generation1 (E1/M1/H1) and Generation2 (E2/M2/H2)
(Actually, there are many difference in Generation1 chips)

This patch adds ADG feature which controls sound clock

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

include/sound/rcar_snd.h

@@ -15,10 +15,12 @@
 #include <linux/sh_clk.h>
 
 #define RSND_GEN1_SRU	0
+#define RSND_GEN1_ADG	1
 
 #define RSND_GEN2_SRU	0
+#define RSND_GEN2_ADG	1
 
-#define RSND_BASE_MAX	1
+#define RSND_BASE_MAX	2
 
 struct rsnd_scu_platform_info {
 	u32 flags;