ARM: dts: iwg22m: Add iWave RZG1E SODIMM SOM

Add support for iWave RZG1E SODIMM System On Module.
http://www.iwavesystems.com/rz-g1e-sodimm-module.html

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
