media: dt-bindings: mipi-ccs: Add bus-type for C-PHY support

The bus-type property is required for C-PHY support. Add it, including
values for CCP2 and CSI-2 D-PHY.

Also require the bus-type property. Effectively all new sensors are MIPI
D-PHY or C-PHY that cannot be told apart without the bus-type property.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>