Replace aapt support with aapt2

Use aapt2 instead of aapt to compile Android app resources.
Also generate all files into srcjars instead of individual
sources.

Test: m checkbuild
Change-Id: I5a67991a0daf0017e8159b46fcff7d5564a91468

Android.bp

@@ -209,6 +209,7 @@ bootstrap_go_package {
         "soong-java-config",
     ],
     srcs: [
+        "java/aapt2.go",
         "java/androidmk.go",
         "java/app_builder.go",
         "java/app.go",