[gatekeeperd] handle upgrades from software version to HAL

Certain devices, like Shamu, are currently running an interim
software-only gatekeeper. When the HAL for those devices is merged,
we need to handle upgrading to the HAL smoothly.

Bug: 21090356
Change-Id: I5352bc547a43671a08249eae532e8b3ce6b90087
1 file changed