rockchip: rk3188: init CPU freq in clock driver

Init CPU frquency in clock driver instead of in SPL board file,
this will help for use common board file later.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/clk/rockchip/clk_rk3188.c b/drivers/clk/rockchip/clk_rk3188.c
index 9bb9959..dda686c 100644
--- a/drivers/clk/rockchip/clk_rk3188.c
+++ b/drivers/clk/rockchip/clk_rk3188.c
@@ -562,6 +562,9 @@
 #endif
 
 	rkclk_init(priv->cru, priv->grf, priv->has_bwadj);
+
+	/* Init CPU frequency */
+	rkclk_configure_cpu(priv->cru, priv->grf, APLL_HZ, priv->has_bwadj);
 #endif
 
 	return 0;