commit 9698702272e3d00df51964404ce6db75bfb98208
author Mark Salyzyn <salyzyn@google.com> Tue Jan 22 11:24:13 2019 -0800
committer Mark Salyzyn <salyzyn@google.com> Wed Jan 23 16:38:33 2019 +0000
tree 277c78792d00ea20e36f6b8d3c2cdc95a7716ee2
parent 27422768f4a986dc66955c0b49d7a2c9977711fc

fs_mgr: overlay: support non-DAP A/B devices

Loosen some tests and borrow logic from retrofit Dynamic Android
Partitions (DAP) A/B devices.  In non-DAP A/B device case
/mnt/scratch is used, backed by the system other partition.

Tested on taimen with CONFIG_OVERLAY_FS added to its pre 4.6 kernel,
and BOARD_EXT4_SHARE_DUP_BLOCKS := true added to board config. Also
tested on a retrofit DAP A/B device and an untouched taimen.

Test: adb_remount_test.sh
Bug: 120448575
Change-Id: I72aaf4d68db1c3ac380aba425346ab6443cadad3