add option to make_ext4fs to record blocks for each file

Add the -B option to make_ext4fs, which causes it to record the block
ranges used for each (regular) file in the image.  We can use this
information to construct more efficient block-based incremental OTAs.

Bug: 16984795
Change-Id: I2a5325bb89948f63c76e93fdfa84c51f9b050104
10 files changed