dtbhtool: implement unpackdtbhimg

Parses a DTBH image and outputs the information needed
for samsung_dtb.h and dumps all DTBs contained in the file.

Change-Id: Ia724f25c3b33423baeefec85c9b0d42967fce6f2
(cherry picked from commit 25b3f58c5bb9e9cfd2f0282047a2ea13141496cc)
2 files changed