wan: make read-only data const

Change several wan drivers to make strings and other initialize
only parameters const.

Compile tested only (with no new warnings)

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/wan/z85230.c b/drivers/net/wan/z85230.c
index fbf5e84..9395686 100644
--- a/drivers/net/wan/z85230.c
+++ b/drivers/net/wan/z85230.c
@@ -766,7 +766,7 @@
 
 EXPORT_SYMBOL(z8530_interrupt);
 
-static char reg_init[16]=
+static const u8 reg_init[16]=
 {
 	0,0,0,0,
 	0,0,0,0,
@@ -1206,7 +1206,7 @@
  *	it exists...
  */
  
-static char *z8530_type_name[]={
+static const char *z8530_type_name[]={
 	"Z8530",
 	"Z85C30",
 	"Z85230"