synaptics: Disable gesture v2.0

This causes the gesture system to return KEY_F4 and a series of points
regardless of actual gesture drawn.

Change-Id: Ifa7981df63a6e675d0ca64ec40d2ef186a5807e5
touchscreen: Split out gesture enable flags to allow individual control

TODO: Add music handling.  Some of the music flags overlap with
flashlight, requiring extra controls here.

Change-Id: I9749c09acce02f9826bc55737bfce10507303e1e