Torch: only include src files from src dir

Currently if any other folders are present with java
files(especially generated ones), the build system picks them up.

Change-Id: I15d9c66844ab7a0c300f51a02b878d1dda4316fe
Signed-off-by: Roman Birg <roman@cyngn.com>
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_apps_Torch into cm-11.0