ARM: shmobile: lager: add sound support

This patch adds sound support for Lager board.
But, it is using PIO transfer at this point.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
[horms+renesas@verge.net.au: resolved conflicts]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index 7e3f42b..bcbd74c 100644
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig
@@ -272,6 +272,7 @@
 	depends on ARCH_R8A7790
 	select USE_OF
 	select MICREL_PHY if SH_ETH
+	select SND_SOC_AK4642 if SND_SIMPLE_CARD
 
 config MACH_KOELSCH
 	bool "Koelsch board"