Allow developer to control the splash screen style when the option is
used for cold or warm launch an activity.
Bug: 203497083
Test: atest SplashscreenTests#testLaunchFromLauncherWithEmptyIconOptions
Test: atest SplashscreenTests#testLaunchAppWithIconOptions
Change-Id: I9c4ccca2470df5dbac96da2d4a96b616b6670688