Reboot the device on user build after the install fails

Users can't do much after the install fails with the device showing
"error" under recovery. So our best choice is to reboot the device
since sometimes the system image is still bootable (i.e. on package
verification failure). At worst the device would stuck in a boot loop
where the users need the same professional knowledge to recover as
before.

Behaviors after installation failure (including data wipe):
If recovery text is visible:
No change.

If recovery text is not visible:
Old behavior: Wait under "error" screen. Reboot after UI timeout (120s)
              if not connected to usb charger.
New behavior: Wait for 5s (shortens from the 120s timeout) under "error"
              screen and reboot (w or w/o charger).

sideload-auto-reboot (only available for userdebug):
Old behavior: Reboot immediately after installation failure.
New behavior: Wait for 5s under "error" screen and reboot.

Bug: 35386985
Test: On angler user, device auto reboots 5s after a failing OTA.

Change-Id: I3ff0ead86e2ccec9445d6a2865bc2c463855f23c