configs: am57xx_evm: fix ethernet phy configuration

Configure AM57xx EVMs for the exact PHY part that is
present on the various boards. This makes U-Boot apply
configurations needed for this PHY like centering the
FLP timing.

For configurations to take effect, DM_ETH needs to be
enabled. Do that too.

Tested on BeagleBoard x15 and AM571x IDK.

Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
diff --git a/configs/am57xx_evm_defconfig b/configs/am57xx_evm_defconfig
index fc96401..04484e0 100644
--- a/configs/am57xx_evm_defconfig
+++ b/configs/am57xx_evm_defconfig
@@ -52,6 +52,9 @@
 CONFIG_SPI_FLASH_BAR=y
 CONFIG_SPI_FLASH_SPANSION=y
 CONFIG_PHYLIB=y
+CONFIG_PHY_MICREL=y
+CONFIG_PHY_MICREL_KSZ90X1=y
+CONFIG_DM_ETH=y
 CONFIG_DM_PMIC=y
 CONFIG_PMIC_PALMAS=y
 CONFIG_DM_REGULATOR=y