net: miiphybb: Convert ifdef DEBUG to debug()

Replace ifdeffery with plain debug() function call. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Paul Barker <paul.barker.ct@bp.renesas.com>
diff --git a/drivers/net/phy/miiphybb.c b/drivers/net/phy/miiphybb.c
index 171c171..5497b83 100644
--- a/drivers/net/phy/miiphybb.c
+++ b/drivers/net/phy/miiphybb.c
@@ -183,9 +183,7 @@
 	bus->set_mdc(bus, 1);
 	bus->delay(bus);
 
-#ifdef DEBUG
-	printf("miiphy_read(0x%x) @ 0x%x = 0x%04x\n", reg, addr, rdreg);
-#endif
+	debug("miiphy_read(0x%x) @ 0x%x = 0x%04x\n", reg, addr, rdreg);
 
 	return rdreg;
 }