ARM: dts: r8a7744-iwg20d-q7-dbcm-ca: Add device tree for camera DB

This patch adds support for the camera daughter board which is
connected to iWave's RZ/G1N Qseven carrier board.

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>