ARM: shmobile: add sample amixer settings for ap4evb

FSI2A-AK4643 needs amixer setting to use it.
This patch adds quick setting guide

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
1 file changed