Camera button support 1/2

ported from: https://github.com/CyanogenMod/android_packages_apps_Settings/commit/c933e9205f5bef528ee09433a078cd8e626d9424#diff-5ef8d74198f3dd4a8c550fcee1e21d26R232

credit: CM
Merge branch 'kitkat' of https://github.com/LiquidSmooth/android_packages_apps_Settings into HEAD