Add CAMSS block definition for sc8280xp.

This drop contains definitions for the following components on sc8280xp:

VFE * 4
VFE Lite * 4
CSID * 4
CSIPHY * 4

This dtsi definition has been developed and validated on a Lenovo X13s
laptop.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>