net: designware: add clock support

This implementation manages several clocks, disable and
free all of them in case of error during probe and in remove
callback.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/designware.h b/drivers/net/designware.h
index 7992d0e..252cd24 100644
--- a/drivers/net/designware.h
+++ b/drivers/net/designware.h
@@ -239,6 +239,10 @@
 #ifdef CONFIG_DM_GPIO
 	struct gpio_desc reset_gpio;
 #endif
+#ifdef CONFIG_CLK
+	struct clk *clocks;	/* clock list */
+	int clock_count;	/* number of clock in clock list */
+#endif
 
 	struct phy_device *phydev;
 	struct mii_dev *bus;