Many devices don't have an /oem partition, so find_mount should be
expected to fail, but shouldn't cause the overall remount to fail.
Also clean up all the error handling and reporting, and remove the
dead int* globals.
Bug: http://b/21024141
Change-Id: Ie31021b03c9cab8e972269d7d1ffe383cd30ee9e
This reverts commit 6084a0124f.
The original build breakage is fixed by (a) building the verity
code for eng builds as well as userdebug builds and (b) moving
the exported remount service functions into a new header file.
Change-Id: Ice0c4f97d4db38ab7eb333c7a6e56bbd11123f5b