mx6sabre_common: Add Fastboot support

Tested basic fastboot commands, such as:

On the mx6qsabresd U-boot prompt:

=> fastboot 0

On the host PC:

$ fastboot getvar bootloader-version -i 0x0525
bootloader-version: U-Boot 2015.10-rc2-23960-g2462cce-dirty
finished. total time: 0.000s

$ fastboot reboot  -i 0x0525 --> board reboots fine.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
1 file changed