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

android/soongconfig/Android.bp

@@ -0,0 +1,13 @@
+bootstrap_go_package {
+    name: "soong-android-soongconfig",
+    pkgPath: "android/soong/android/soongconfig",
+    deps: [
+        "blueprint",
+        "blueprint-parser",
+        "blueprint-proptools",
+    ],
+    srcs: [
+        "config.go",
+        "modules.go",
+    ],
+}