drivers/net/*/: Use static const

Using static const generally increases object text and decreases data size.
It also generally decreases overall object size.

Signed-off-by: Joe Perches <joe@perches.com>
diff --git a/drivers/net/irda/donauboe.c b/drivers/net/irda/donauboe.c
index b626ccc..f81d944 100644
--- a/drivers/net/irda/donauboe.c
+++ b/drivers/net/irda/donauboe.c
@@ -818,9 +818,9 @@
 {
   int i, j, n;
 #ifdef USE_MIR
-  int bauds[] = { 9600, 115200, 4000000, 1152000 };
+  static const int bauds[] = { 9600, 115200, 4000000, 1152000 };
 #else
-  int bauds[] = { 9600, 115200, 4000000 };
+  static const int bauds[] = { 9600, 115200, 4000000 };
 #endif
   unsigned long flags;