drivers/net/tulip: fix warning: format not a string literal and no ...

Impact: Use 'static const char[]' instead of 'static char[]' and while
being at it add a KERN_INFO prefix.

Fix this warning:
  drivers/net/tulip/de4x5.c: In function 'de4x5_hw_init':
  drivers/net/tulip/de4x5.c:1268: warning: format not a string literal and no format arguments
  drivers/net/tulip/winbond-840.c: In function 'w840_init':
  drivers/net/tulip/winbond-840.c:1666: warning: format not a string literal and no format arguments

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: David S. Miller <davem@davemloft.net>