Smartspace - Don't create session ahead of init

After the device is setup, if the smartspace component is not
available/initialized, don't attempt to start a session.

Fixes: 199986217
Test: atest LockscreenSmartspaceControllerTest
Change-Id: I36d6f75b37cc5f5274b1cea3a35338f6da424a20
(cherry picked from commit 076aad91)
(cherry picked from commit 1c127572)