[2/2] Camera: add software HDR rendering

Since Camera stuff is compiled with Gallery2, we have to make sure the
renderscript files are compiled too.

Change-Id: Ia377a6f1e4839000aa528febc5c2b3fe42155be6
Merge branch 'cm-10.1' of github.com:CyanogenMod/android_packages_apps_Gallery2 into cm-10.1