dtbtool: update from CAF

Change-Id: I108a6fcfc7da8e254f9ae6d8a3dfb3319965c015
Find7: /cache and /persist are ext4 partitions

Change-Id: Icb7750cf17df76698c6cf065d64e52fa44babbe2
Find7: We have several ext4 partitions larger than 2gb

Change-Id: Ifd7a2ae9ade490072fb46cd49e7604db5ee2cd87
Find7: disable some bringup leftover flags from Hammerhead

Change-Id: I53a7dfb2f852ad74ffb2bcde08aedf1103f6b2e7