Don't error out because SensorEventConnection::dump overloads BBinder::dump

clang warns about SensorEventConnection::dump overloading BBinder::dump
in some conditions.

Since the cause isn't fixable without changing the API, tell clang not
to error out on it.

Change-Id: I15659de7c5499d937019599cfefb01305039e6b5
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>