ARM: mvebu: add audio support to Armada 385 DB

This commit adds the necessary Device Tree information to enable
audio support on the Armada 385 DB platform. In details it:

 * Instantiates the CS42L51 audio codec on the I2C0 bus

 * Adds simple-card DT binding for audio on Armada 385 DB

 * Adds description for both analog I2S and S/PDIF I/O

 * Disabled by default

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: Nadav Haklai <nadavh@marvell.com>
Tested-by: Star_Automation <star@marvell.com>
Tested-by: Lior Amsalem <alior@marvell.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>