powerpc/44x: Use correct phy-address dt nodes on taishan.dts

Taishan (440GX) has the first PHY (EMAC2) mapped at PHY address 1
and the 2nd PHY (EMAC3) at PHY address 3. Use "phy-address" to
correctly describe this instead of "phy-map".
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

arch/powerpc/boot/dts/taishan.dts

@@ -337,7 +337,7 @@ EMAC2: ethernet@40000c00 {
 				rx-fifo-size = <4096>;
 				tx-fifo-size = <2048>;
 				phy-mode = "rgmii";
-				phy-map = <0x00000001>;
+				phy-address = <1>;
 				rgmii-device = <&RGMII0>;
 				rgmii-channel = <0>;
  				zmii-device = <&ZMII0>;
@@ -361,7 +361,7 @@ EMAC3: ethernet@40000e00 {
 				rx-fifo-size = <4096>;
 				tx-fifo-size = <2048>;
 				phy-mode = "rgmii";
-				phy-map = <0x00000003>;
+				phy-address = <3>;
 				rgmii-device = <&RGMII0>;
 				rgmii-channel = <1>;
  				zmii-device = <&ZMII0>;