Move the logic of deciding what all insets are controllable to InsetsPolicy.

- It makes more sense to have it in InsetsPolicy because this is something that OEMs can change.

Fix: b/226613098
Test: atest WindowContainerInsetsSourceProviderTest
Change-Id: Ie54f9457b4063b07a37198e04c05d30f083bd5c9
2 files changed