ARM: dts: iwg20d-q7-dbcm-ca: Add device trees for camera DB

This patch adds a .dtsi that describes the camera daughter board
and a .dts to describe the HW made of iWave's RZ/G1M SoM, iWave's
RZ/G1M/G1N Qseven carrier board, and the camera daughter board.
The camera daughter board .dtsi adds support for ttySC[14].

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Chris Paterson <chris.paterson2@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>