configs: a64-olinuxino-emmc: add eMMC boot part config commands

mmc bootbus and partconf commands are needed in order to be able to
configure booting from separate boot0/boot1 eMMC partitions.

Signed-off-by: Petr Štetiar <ynezz@true.cz>
[jagan: rebase on master]
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/configs/a64-olinuxino-emmc_defconfig b/configs/a64-olinuxino-emmc_defconfig
index d2618d5..08687cb 100644
--- a/configs/a64-olinuxino-emmc_defconfig
+++ b/configs/a64-olinuxino-emmc_defconfig
@@ -7,5 +7,6 @@
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
 CONFIG_DEFAULT_DEVICE_TREE="sun50i-a64-olinuxino-emmc"
 CONFIG_SUN8I_EMAC=y
+CONFIG_SUPPORT_EMMC_BOOT=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_OHCI_HCD=y