Porting the FSL android fastboot features from imx u-boot v2018.03 to
support all SoCs: imx6/imx7/imx7ulp/imx8/imx8m.
The UUU commands like UCmd and ACmd are also added. Users need set
CONFIG_FASTBOOT_UUU_SUPPORT=y to enable the feature.
Signed-off-by: Frank Li
Signed-off-by: Ye Li
(cherry picked from commit 65120b06a7f750b9b1a6e0db3d2082cc7088d5a8)
(cherry picked from commit 9b149c2a28829fe7017f83981d634157bc31cc94)