Upgrade to ManifestMerger2

Switch to using ManifestMerger2 from
prebuilts/gradle-plugin/com/android/tools/build/manifest-merger/26.0.0-beta2/manifest-merger-26.0.0-beta2.jar

Bug: 36005379
Test: m -j checkbuild
Change-Id: I83bd3f95778e93796d06f063aa7c61d2a63b117b
Merged-In: I83bd3f95778e93796d06f063aa7c61d2a63b117b
(cherry picked from commit e76e8021ebaca486aee8e82d6a3ce25a10bc3974)
2 files changed