Fix lib cameraservice derp
libcameraservice: Fix build in ISO C++11 mode

Change log macro define so it can't be confused for a C++11 string
literal

Change-Id: Idcc8085735177aa3313fdea66dc0736cca749f9b
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>