Do not umount /vendor, /system, and /oem even if they are R/W.

am: 45ae1b2754

Change-Id: I6771f2e77f382662b4f17575d5b651c5cd0c3233
This commit is contained in:
Keun-young Park 2017-07-18 20:58:51 +00:00 committed by android-build-merger
commit 13dfe79028

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