Camera: ISO C++11 build fixes

Fix build in ISO C++11 mode:
- enum typesafety
- constexpr

Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
Revert "Camera: ISO C++11 build fixes"

This reverts commit 66ef2f239719d2a04f62014e7144f85e31075c78.
Merge branch 'ics' of github.com:vineethraj49/android_packages_apps_Camera into ics
Camera: ISO C++11 build fixes

Fix build in ISO C++11 mode:
- enum typesafety
- constexpr

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