net: stmmac: Fix clock en-/disable calls

clk_{un}prepare is mandatory for platforms using common clock framework.
Since these drivers are used by SPEAr platform, which supports common
clock framework, add clk_{un}prepare() support for them. Otherwise
the clocks are not correctly en-/disabled and ethernet support doesn't
work.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Viresh Kumar <viresh.linux@gmail.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 94b21b4..dc20c56 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -109,7 +109,7 @@
 static inline int stmmac_clk_enable(struct stmmac_priv *priv)
 {
 	if (!IS_ERR(priv->stmmac_clk))
-		return clk_enable(priv->stmmac_clk);
+		return clk_prepare_enable(priv->stmmac_clk);
 
 	return 0;
 }
@@ -119,7 +119,7 @@
 	if (IS_ERR(priv->stmmac_clk))
 		return;
 
-	clk_disable(priv->stmmac_clk);
+	clk_disable_unprepare(priv->stmmac_clk);
 }
 static inline int stmmac_clk_get(struct stmmac_priv *priv)
 {