ARM: shmobile: lager: add VIN1/ADV7180 device nodes

Add the Lager board specific device node part for VIN1 (composite video in);
add the device node for Analog Devices ADV7180 video decoder to IIC2 bus.
Add the necessary subnodes to interconnect VIN1 and ADV7180 devices.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
[Sergei: rebased, edited changelog and summary]
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>