Convert frameworks/base/cmds/* to Android.bp

See build/soong/README.md for more information.

Also converts the rest of frameworks/base/tools/streaming_proto.

Bug: 122332340
Test: m checkbuild
Change-Id: I87c500c5464fb1722b4b518d89065f5e1ee29a97
(cherry picked from commit 45c0d71e774c84ec81392393a0fafad398d2838d)
diff --git a/cmds/bu/Android.bp b/cmds/bu/Android.bp
new file mode 100644
index 0000000..0866ee0
--- /dev/null
+++ b/cmds/bu/Android.bp
@@ -0,0 +1,8 @@
+// Copyright 2011 The Android Open Source Project
+//
+
+java_binary {
+    name: "bu",
+    wrapper: "bu",
+    srcs: ["**/*.java"],
+}