rockchip: clk: rk3328: add clk_enable ops for HCLK_HOST0

Required to successfully probe the ehci generic driver

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/clk/rockchip/clk_rk3328.c b/drivers/clk/rockchip/clk_rk3328.c
index a89e2ec..5957a00 100644
--- a/drivers/clk/rockchip/clk_rk3328.c
+++ b/drivers/clk/rockchip/clk_rk3328.c
@@ -745,10 +745,22 @@
 	return -ENOENT;
 }
 
+static int rk3328_clk_enable(struct clk *clk)
+{
+	switch (clk->id) {
+	case HCLK_HOST0:
+		/* Required to successfully probe the ehci generic driver */
+		return 0;
+	}
+
+	return -ENOENT;
+}
+
 static struct clk_ops rk3328_clk_ops = {
 	.get_rate = rk3328_clk_get_rate,
 	.set_rate = rk3328_clk_set_rate,
 	.set_parent = rk3328_clk_set_parent,
+	.enable = rk3328_clk_enable,
 };
 
 static int rk3328_clk_probe(struct udevice *dev)