Convert more Android.mk files to Android.bp

These modules have their dependencies satisfied, and aren't doing
anything strange.

Change-Id: I72039a15256cbd5e5eee0d79a15d66d74a6c087d
diff --git a/reboot/Android.bp b/reboot/Android.bp
new file mode 100644
index 0000000..805fd9a
--- /dev/null
+++ b/reboot/Android.bp
@@ -0,0 +1,8 @@
+// Copyright 2013 The Android Open Source Project
+
+cc_binary {
+    name: "reboot",
+    srcs: ["reboot.c"],
+    shared_libs: ["libcutils"],
+    cflags: ["-Werror"],
+}