Add flag for lazy variation instance creation

Bug: 324150794
Test: Manually done
Test: adb shell cat /proc/`adb shell pidof com.android.systemui`/maps
Test: minikin_tests
Test: atest CtsWidgetTestCases
Test: atest CtsTextTestCases
Test: atest CtsGraphicsTestCases
Test: atest FrameworksCoreTests:android.text
Change-Id: I436bbef3d5a53807c324e43d5493f661d82552c4