WAN: split hd6457x.c into hd64570.c and hd64572.c

Supporting both original SCA and SCA-II in one file was nice at some
point but now it's increasingly painful.

Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>
diff --git a/drivers/net/wan/pci200syn.c b/drivers/net/wan/pci200syn.c
index bba111c..f4aa326 100644
--- a/drivers/net/wan/pci200syn.c
+++ b/drivers/net/wan/pci200syn.c
@@ -127,7 +127,7 @@
 #undef memcpy_toio
 #define memcpy_toio new_memcpy_toio
 
-#include "hd6457x.c"
+#include "hd64572.c"
 
 
 static void pci200_set_iface(port_t *port)