arm: dts: k3-j721e: Add I2C nodes

J721e SoC has 2 I2C instances in MCU domain and 7 I2C instances in main
domain. Add DT nodes for the same

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>