InCallUI: Disable Back button on Non-intursive InCall Card

Fix for jira issue http://jira.omnirom.org/browse/OMNI-296

PS2 to PS5: code cleanup

PS6: Remove Jira issue url from code

Change-Id: I257daccbb175265e2430f1b0b30c9175cb4b1981
Disable Touch by Proximity Sensor

Support Sweep2Wake/DoubleTap2wake/Knock2Wake features in custom
kernels which prevent touch from sleeping when screen is off.

Change-Id: Ic5bdaf63ffe7502ad164b6e3022ffe8393011e1e