LicenseHtmlGeneratorFromXml, LicenseHtmlLoader and indirecly AsyncLoader
shoud be commonly used by Settings and TvSettings.
So this CL will move them to SettingsLib.
Test: building succeeded and tested on sailfish.
make ROBOTEST_FILTER=SettingsLicenseActivityTest RunSettingsRoboTests
Change-Id: I12e9169b1d3d313a6c5da0d575a6526327268381