clk: mvebu: Add corediv clock driver for Armada 370/XP
Newer Marvell MVEBU SoC like Armada 370/XP have an additional core
clock divider for e.g. NAND clock. Add the corresponding driver based
on the Linux driver.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>