fingerprint and build desc update

Make BUILD_FINGERPRINT and PRIVATE_BUILD_DESC to reflect what we build
isntead of using some static string from another device or some
self-made imaginary string. This could be useful when looking at logs.

Change-Id: Id3572d0b5466f836a63e5a7d097c84c8a6fe0520
Merge branch 'cm-11.0' of https://github.com/Mustaavalkosta/android_device_htc_ace into cd-4.4