While trying using a peripheral clock on a driver, I saw that the clock
pointer returned by the provider was NULL.

The problem was a missing indirection. It was the pointer stored in the
hws array which needed to be updated not the value it contains.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Fixes: 8ca4746a ("clk: mvebu: Add the peripheral clock driver for Armada 3700")
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>