clk: dove: fix refcount leak in dove_clk_init()

The of_find_compatible_node() returns a node pointer with refcount
incremented, but there is the lack of use of the of_node_put() when
done. Add the missing of_node_put() to release the refcount.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Fixes: 8f7fc545 ("clk: mvebu: dove: maintain clock init order")
Fixes: 63b8d92c ("clk: add Dove PLL divider support for GPU, VMeta and AXI clocks")
Signed-off-by: Stephen Boyd <sboyd@kernel.org>