ARM: dts: r8a7742-iwg21d-q7-dbcm-ca: Add can0 support to camera DB

This patch enables CAN0 interface exposed through connector J4 on the
camera DB.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Chris Paterson <Chris.Paterson2@renesas.com>
Link: https://lore.kernel.org/r/20200911083615.17377-1-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>