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If the pen device is disabled while the pen is near the screen it leads
to infinite recursion. This is because we make a call to disable palm
suppression, which revalidates device enablement. Post a task instead
of disabling inline to fix this.

The same thing happens if we lose events since Reinitialize() gained
a call to ReleaseButtons() when pen support was added, which calls
ReportEvents(), which can again call Reinitialize(). To fix that one,
kill ReleaseButtons() as ReleaseTouches() should be sufficient.

BUG=814071
TEST=powerd_dbus_suspend with pen touching screen

Change-Id: I8bb66feddc7961f1fa28d062133671ad1c46948c
Reviewed-on: https://chromium-review.googlesource.com/961386Reviewed-by: Kevin Schoedel <kpschoedel@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543185}