rockchip: defconfig: puma-rk3399: enable CONFIG_PHY_MICREL_KSZ9031

The RK3399-Q7 has a KSZ9031 GbE PHY. Enable support for it in defconfig.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/puma-rk3399_defconfig b/configs/puma-rk3399_defconfig
index 33e075f..4e5c923 100644
--- a/configs/puma-rk3399_defconfig
+++ b/configs/puma-rk3399_defconfig
@@ -46,6 +46,7 @@
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_WINBOND=y
 CONFIG_PHY_MICREL=y
+CONFIG_PHY_MICREL_KSZ9031=y
 CONFIG_DM_ETH=y
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_GMAC_ROCKCHIP=y