zeus branch doesn't boot on eMMC

[arunlee77]

It looks like the zeus branch is broken w.r.t eMMC boot support.

Steps:

1. Follow the Quick start guide and setup the sources and build area
2. make the following modifications to the conf/local.conf file UBOOT_CONFIG = "emmc" UBOOT_CONFIG[emmc] = "mx8mq_phanbell_defconfig,sdcard"

The build is success.

Flashing:

1. Interrupt u-boot (boot from sd-card) and enter ums 0 mmc 0
2. dd the .wic.gz image to the enumerated disk
3. Ctrl+C at uboot prompt and enter fastboot 0
4. fastboot flash bootloader0 imx-boot
5. change the dip switches to boot from MMC

Additional Info: The above procedure works well for warrior branch.