adi_rebuild_devicetrees.sh: New script to rebuild devicetree.dtb from dts

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
adi_update_tools.sh: speed up build

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Merge branch 'master' of https://github.com/analogdevicesinc/linux_image_ADI-scripts