FROMLIST: cmd: Add dtimg command

dtimg command allows user to work with Android DTB/DTBO image format.
Such as, getting the address of desired DTB/DTBO file, printing the dump
of the image in U-Boot

FROMLIST: cmd: Add dtimg command

dtimg command allows user to work with Android DTB/DTBO image format.
Such as, getting the address of desired DTB/DTBO file, printing the dump
of the image in U-Boot shell, etc.

This command is needed to provide Android boot with new Android DT image
format further.

Change-Id: I2a626f333f604b6f0424aa03feaddab4e8506a3f
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Zhangbin Tong <zebulun.tong@rock-chips.com>
(am from http://patchwork.ozlabs.org/patch/925871/)

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