Dump non-encrypted iOS device tree extracted from im4p

iOS device tree files are not encrypted after iOS 10. So, with img4tool from @xerub ,

> img4 -image ./all_flash/DeviceTree.d22ap.im4p /tmp/d22ap-dt.bin 

Then we can do something like

> ./dtdump /tmp/d22ap-dt.bin 

or

> ./dtdump -v /tmp/d22ap-dt.bin 

-v means dump values in hexdecimal