clk: imx: imx8mm: Mark init function __init

It calls another __init marked function and thus causes a section
mismatch if we don't mark it this way.

Fixes: ba5625c3 ("clk: imx: Add clock driver support for imx8mm")
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/imx/clk-imx8mm.c

@@ -379,7 +379,7 @@ static struct clk ** const uart_clks[] __initconst = {
 	NULL
 };
 
-static int imx8mm_clocks_init(struct device_node *ccm_node)
+static int __init imx8mm_clocks_init(struct device_node *ccm_node)
 {
 	struct device_node *np;
 	void __iomem *base;