Jerry Zhang 6032c354d9 Remove ptp from persist config on boot
We got a report from a user in which ptp was set in the
persistent config, likely from a previous version.
This causes errors in the usb state and is not removed
by an ota. To fix, remove ptp in the same place that mtp
is removed from the persistent config.

Bug: 62202885
Test: Add ptp to persistent config, verify removed.
Change-Id: I5ebd93b9c8a49bcaca5a3362e49ed1e1acf50a9b
2017-06-02 12:05:03 -07:00
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