linux-phytec-ti

scripts/dtb-merge: add tool for merging DTB overlays

Add tool for merging DT overlays into single DTB file. This parses
all the available .its files to find out the configuration needed
for the DTB. Once matching config is found, passes the data
to fdtoverlay tool to merge everything into a single .dtb.

Signed-off-by: Tero Kristo <t-kristo@ti.com>