driver: net: fm: minor fix in DM ETH support

Bus callback functions for read/write/reset need to be set only for
DM_ETH, moving endif a bit lower.

Signed-off-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/drivers/net/fm/eth.c b/drivers/net/fm/eth.c
index 5f1a023..371c5d2 100644
--- a/drivers/net/fm/eth.c
+++ b/drivers/net/fm/eth.c
@@ -54,10 +54,10 @@
 	bus.priv = priv->mac->phyregs;
 #else
 	bus.priv = priv->pcs_mdio;
-#endif
 	bus.read = memac_mdio_read;
 	bus.write = memac_mdio_write;
 	bus.reset = memac_mdio_reset;
+#endif
 
 qsgmii_loop:
 	/* SGMII IF mode + AN enable only for 1G SGMII, not for 2.5G */