cmd: Make CMD_LZMA / CMD_UNZIP default y if CMD_BOOTI

In the Linux Kernel on ARM64, the Image.COMPRESSION file is not
self-extracting in the way that x86 and ARM images are.  So when
CMD_BOOTI is enabled we should also default to enabling CMD_UNZIP and
CONFIG_LZMA in order for the user to be able to decompress many of the
common compressions that will be done to an Image file.

Signed-off-by: Tom Rini <trini@konsulko.com>