Fixing potential NullPointer exceptions when Launcher is
created before TouchInteractionService is initialized

SystemUiProxy is a wrapper opject which holds the state information
until the actual proxy is initialized. It is safe to be initialized
lazily.

Bug: 221961069
Test: Verified on device
Change-Id: I1a621cad52e5b8384439ef02de6b95c6452bcb06
7 files changed