ARM: renesas: Enable DM_ETH_PHY on 64-bit R-Car boards

Enable DM_ETH_PHY to correctly release the PHY on these boards from reset.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/configs/r8a779a0_falcon_defconfig b/configs/r8a779a0_falcon_defconfig
index 5350447..93f1055 100644
--- a/configs/r8a779a0_falcon_defconfig
+++ b/configs/r8a779a0_falcon_defconfig
@@ -65,6 +65,7 @@
 CONFIG_BITBANGMII_MULTI=y
 CONFIG_PHY_MICREL=y
 CONFIG_PHY_MICREL_KSZ90X1=y
+CONFIG_DM_ETH_PHY=y
 CONFIG_RENESAS_RAVB=y
 CONFIG_DM_REGULATOR=y
 CONFIG_DM_REGULATOR_FIXED=y