Put singleton static instance declarations into the android namespace

clang 3.4 complains about the declarations happening outside of the
namespace being a C++11 extension.
Putting them into the namespace works with all compilers.

Change-Id: I7d5d840a89b16baa8553ffc69b6c57134fc36178
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>