net: miiphybb: Update debug() print

Update the debug() print, use __func__ to always print matching
function name, and also print bus name in case there are multiple
busses.

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 5497b83..9f5f9b1 100644
--- a/drivers/net/phy/miiphybb.c
+++ b/drivers/net/phy/miiphybb.c
@@ -183,7 +183,7 @@
 	bus->set_mdc(bus, 1);
 	bus->delay(bus);
 
-	debug("miiphy_read(0x%x) @ 0x%x = 0x%04x\n", reg, addr, rdreg);
+	debug("%s[%s](0x%x) @ 0x%x = 0x%04x\n", __func__, miidev->name, reg, addr, rdreg);
 
 	return rdreg;
 }