disable ro.ril.enable.dtm

Thanks for the tip to "a user" @ XDA

Original posts:
http://forum.xda-developers.com/showpost.php?p=36676344&postcount=73
http://forum.xda-developers.com/showpost.php?p=36717931&postcount=104
http://forum.xda-developers.com/showpost.php?p=36748649&postcount=140
additional tweaks
[*] increase min_free_kbytes
[*] give permissions for vpn
[*] cleanup ueventd a bit
[*] add various build prop tweaks

--from aospX by existz -- https://www.github.com/aospX
ramdisk: correct msm_vidc permissions to audio, not graphics
system.prop: remove unused prop line
update mount options
Merge branch 'jb-mv' of git://github.com/Mustaavalkosta/android_device_htc_ace into jb-mr1