arm64: defconfig: Enable Broadcom BCM54140 PHY

Enable support for the QuadPHY on the Kontron K-Box A-230-LS. Enable
the driver as a module.
Signed-off-by: NMichael Walle <michael@walle.cc>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/configs/defconfig

@@ -351,6 +351,7 @@ CONFIG_QCOM_IPA=m
 CONFIG_MDIO_BUS_MUX_MMIOREG=y
 CONFIG_MDIO_BUS_MUX_MULTIPLEXER=y
 CONFIG_AQUANTIA_PHY=y
+CONFIG_BCM54140_PHY=m
 CONFIG_MARVELL_PHY=m
 CONFIG_MARVELL_10G_PHY=m
 CONFIG_MESON_GXL_PHY=m