defconfig: 8084: Enable secure touch

Enable this feature in the drivers for the Atmel MXT and the
Synaptics controllers.
The feature is turned on/off at runtime via a sysfs file.

Change-Id: I9660ee989788a4f84f700d823a5ced31c6c5ce5b
Acked-by: Christian Bolis <cbolis@qti.qualcomm.com>
Signed-off-by: Keith Fallows <keithf@codeaurora.org>