tilapia: enable USSD Dialer in Settings

Change-Id: I57911374ca9c04759af377a67b5fed32241bab53
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
Merge branch 'jb-mr2' of https://github.com/AOKP/device_asus_tilapia into linaro2