Soong package structure refactoring

Give prebuilt_etc and sh_binary their own packages and split the
gigantic main Android.bp up to small, per-package ones.

Test: m nothing, TreeHugger
Bug: 156980228
Change-Id: I7b00cd344b9f16861f1ff39edf0029f016b853d0
diff --git a/android/Android.bp b/android/Android.bp
new file mode 100644
index 0000000..47dbc5d
--- /dev/null
+++ b/android/Android.bp
@@ -0,0 +1,80 @@
+bootstrap_go_package {
+    name: "soong-android",
+    pkgPath: "android/soong/android",
+    deps: [
+        "blueprint",
+        "blueprint-bootstrap",
+        "soong",
+        "soong-android-soongconfig",
+        "soong-env",
+        "soong-shared",
+        "soong-ui-metrics_proto",
+    ],
+    srcs: [
+        "androidmk.go",
+        "apex.go",
+        "api_levels.go",
+        "arch.go",
+        "config.go",
+        "csuite_config.go",
+        "defaults.go",
+        "defs.go",
+        "expand.go",
+        "filegroup.go",
+        "hooks.go",
+        "image.go",
+        "makevars.go",
+        "metrics.go",
+        "module.go",
+        "mutator.go",
+        "namespace.go",
+        "neverallow.go",
+        "notices.go",
+        "onceper.go",
+        "override_module.go",
+        "package.go",
+        "package_ctx.go",
+        "path_properties.go",
+        "paths.go",
+        "prebuilt.go",
+        "proto.go",
+        "register.go",
+        "rule_builder.go",
+        "sandbox.go",
+        "sdk.go",
+        "singleton.go",
+        "soong_config_modules.go",
+        "testing.go",
+        "util.go",
+        "variable.go",
+        "visibility.go",
+        "vts_config.go",
+        "writedocs.go",
+
+        // Lock down environment access last
+        "env.go",
+    ],
+    testSrcs: [
+        "android_test.go",
+        "androidmk_test.go",
+        "arch_test.go",
+        "config_test.go",
+        "csuite_config_test.go",
+        "expand_test.go",
+        "module_test.go",
+        "mutator_test.go",
+        "namespace_test.go",
+        "neverallow_test.go",
+        "onceper_test.go",
+        "package_test.go",
+        "path_properties_test.go",
+        "paths_test.go",
+        "prebuilt_test.go",
+        "rule_builder_test.go",
+        "soong_config_modules_test.go",
+        "util_test.go",
+        "variable_test.go",
+        "visibility_test.go",
+        "vts_config_test.go",
+    ],
+}