Makefile: add support to generate LZMA compressed u-boot image

This patch adds support for generating LZMA compressed u-boot image.
The compressed image can be used for SPL to reduce the size of the u-boot
binary.

Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
1 file changed