support for per-partition fs_type

Include the recovery.fstab file in the recovery image.  Remove the
global fs_type and partition_type values from the target-files
key/value dict, and parse the recovery.fstab file instead to find
types for each partition.

(Cherrypicked from gingerbread w/some edits to resolve conflicts.)

Change-Id: Ic3ed85ac5672d8fe20280dacf43d5b82053311bb
5 files changed