init: create android::init:: namespace

With some small fixups along the way

Test: Boot bullhead
Test: init unit tests
Change-Id: I7beaa473cfa9397f845f810557d1631b4a462d6a
diff --git a/init/bootchart.h b/init/bootchart.h
index 0e3593d..e4f7b59 100644
--- a/init/bootchart.h
+++ b/init/bootchart.h
@@ -20,6 +20,12 @@
 #include <string>
 #include <vector>
 
+namespace android {
+namespace init {
+
 int do_bootchart(const std::vector<std::string>& args);
 
+}  // namespace init
+}  // namespace android
+
 #endif /* _BOOTCHART_H */