Generate license html file from xml files of partitions

Treble-ization requires each partner to store their license information
into their own partition because each partition can be updated
individually.
So each partition will have its own NOTICE.xml.gz, and Settings should
be able to generate license html from xml files of partitions.

Test: building succeeded and tested on sailfish.
  make ROBOTEST_FILTER=LicenseHtmlGeneratorFromXmlTest RunSettingsRoboTests
  make ROBOTEST_FILTER=LicenseHtmlLoaderTest RunSettingsRoboTests
  make ROBOTEST_FILTER=SettingsLicenseActivityTest RunSettingsRoboTests
Bug: 37099941
Merged-In: If797759d300ee20dd43ad8efd7d17b4f7e0c4537
Change-Id: If797759d300ee20dd43ad8efd7d17b4f7e0c4537
(cherry picked from commit 74812873f41adbd34ab3ff4fbd7dcbb8f6fde233)
6 files changed