net: phy: national: remove definition of DEBUG

Defining DEBUG should only be done in development.
So remove DEBUG.
Signed-off-by: NTom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20210115235346.289611-1-trix@redhat.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>

drivers/net/phy/national.c

@@ -19,8 +19,6 @@
 #include <linux/phy.h>
 #include <linux/netdevice.h>
 
-#define DEBUG
-
 /* DP83865 phy identifier values */
 #define DP83865_PHY_ID	0x20005c7a