arm64: dts: Add dts files for Marvell Berlin4CT SoC

Add initial dtsi file to support Marvell Berlin4CT SoC with
quad Cortex-A53 CPUs.

It also adds dts file for Marvell Berlin4CT DMP board which is
based on Berlin4CT SoC.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>