arm64: dts: Add I2C DT nodes for Stingray SoC

This patch adds I2C DT nodes on Stingray SoC.

Signed-off-by: Oza Pawandeep <oza.oza@broadcom.com>
Reviewed-by: Vikram Prakash <vikram.prakash@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>