clk: mvebu: add clock support for Armada 375

Add the clock support for the new SoC Armada 375: core clocks and
gating clocks.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

diff --cc drivers/clk/mvebu/Kconfig
Simple merge

diff --cc drivers/clk/mvebu/Makefile
Simple merge

diff --cc drivers/clk/mvebu/armada-375.c
Simple merge