clk: sunxi-ng: Make fractional helper less chatty

ccu_frac_helper_read_rate() prints some info which is not really
helpful except during debugging.

Replace printk() with pr_debug().

Fixes: 89a3dfb7 ("clk: sunxi-ng: Add fractional lib")
Signed-off-by: NJernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: NChen-Yu Tsai <wens@csie.org>

drivers/clk/sunxi-ng/ccu_frac.c

@@ -67,17 +67,17 @@ unsigned long ccu_frac_helper_read_rate(struct ccu_common *common,
 {
 	u32 reg;
 
-	printk("%s: Read fractional\n", clk_hw_get_name(&common->hw));
+	pr_debug("%s: Read fractional\n", clk_hw_get_name(&common->hw));
 
 	if (!(common->features & CCU_FEATURE_FRACTIONAL))
 		return 0;
 
-	printk("%s: clock is fractional (rates %lu and %lu)\n",
+	pr_debug("%s: clock is fractional (rates %lu and %lu)\n",
 		 clk_hw_get_name(&common->hw), cf->rates[0], cf->rates[1]);
 
 	reg = readl(common->base + common->reg);
 
-	printk("%s: clock reg is 0x%x (select is 0x%x)\n",
+	pr_debug("%s: clock reg is 0x%x (select is 0x%x)\n",
 		 clk_hw_get_name(&common->hw), reg, cf->select);
 
 	return (reg & cf->select) ? cf->rates[1] : cf->rates[0];