Update Companion Version to 2.21ai2

Change-Id: I4f37f388e80a490dc7d87d55bd2fcc926841e429
Set minSdk back to 3. This removes support for screen density settings.

Set back minSdK to 3. Removes tablet densities. We need to better
understand how to make this change correctly so Canvas, Balls and
Sprites behave properly.

Change-Id: I22d514866c2b31fd0132c563818e6d94ab67a51d
Update Companion Version to 2.22ai2.

Change-Id: Icecf2daad3064c28a644221143a7e8d190f28b83