Reintroduce KM0 decryption support

On Android 7 and earlier on FP2, the legacy API version 0.3 Qualcomm
keymaster is used to encrypt the data partition (FDE). Reintroduce
support for legacy keymasters, to be able to decrypt userdata after a
Android 7-to-9 upgrade.

Issue: FP2P-383
Issue: FP2P-506
Change-Id: I057dce6aaef37ebcd7769447a57455c9dd650234
3 files changed