stmmac: add CSR Clock range selection

This patch adds the CSR Clock range selection.

Original patch from Johannes Stezenbach fixed the CSR
in the stmmac_mdio. We agreed to provide this through
the platform instead of.
Also thanks to Johannes for having tested it on ARM.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Johannes Stezenbach <js@sig21.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index a4adf0d..c87c88c 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -32,6 +32,7 @@
 struct plat_stmmacenet_data {
 	int bus_id;
 	int pbl;
+	int clk_csr;
 	int has_gmac;
 	int enh_desc;
 	void (*fix_mac_speed)(void *priv, unsigned int speed);