* add u-boot support for uDPU
* add line to copy u-boot binary to STAGING_DIR_IMAGE, this can later be used
as BL33 variable required for ATF build
* add patch to increase max gunzip size in mvebu_armada-37xx.h which is
required for booting the itb recovery images

Signed-off-by: Vladimir Vid <vladimir.vid@sartura.hr>