arm64: dts: marvell: add CP110 uart peripherals

The CP110 component has 4 uart peripherals. All of them use the same clock
gate for slow peripherals that is shared with the i2c and spi peripherals.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>