arm64: zynqmp: Enable EMMC boot

Enable EMMC boot commands to be able to change EMMC setup.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/xilinx_versal_virt_defconfig b/configs/xilinx_versal_virt_defconfig
index 5175571..b4123a9 100644
--- a/configs/xilinx_versal_virt_defconfig
+++ b/configs/xilinx_versal_virt_defconfig
@@ -51,6 +51,7 @@
 CONFIG_I2C_EEPROM=y
 CONFIG_SYS_I2C_EEPROM_ADDR=0x0
 CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW=0x0
+CONFIG_SUPPORT_EMMC_BOOT=y
 CONFIG_MMC_IO_VOLTAGE=y
 CONFIG_MMC_UHS_SUPPORT=y
 CONFIG_MMC_HS400_SUPPORT=y