ARM: stm32: Enable KSZ90x1 PHY driver on DHCOR

Enable KSZ9x01 PHY driver in DHCOR common configuration, since the
AV96 board has this PHY populated on the PCB.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
diff --git a/configs/stm32mp15_dhcor_basic_defconfig b/configs/stm32mp15_dhcor_basic_defconfig
index aa000ef..2356de7 100644
--- a/configs/stm32mp15_dhcor_basic_defconfig
+++ b/configs/stm32mp15_dhcor_basic_defconfig
@@ -108,6 +108,8 @@
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_SPI_FLASH_WINBOND=y
 CONFIG_SPI_FLASH_MTD=y
+CONFIG_PHY_MICREL=y
+CONFIG_PHY_MICREL_KSZ90X1=y
 CONFIG_DM_ETH=y
 CONFIG_DWC_ETH_QOS=y
 CONFIG_PHY=y