Move TouchVideoDevice.h

The header file TouchVideoDevice.h does not need to be in the include/
folder, now that EventHub.h has been moved out of there.

Also, make a doc clarification on TouchVideoDevice. The frames are in
the order that they were received from v4l2 device.

Test: presubmit only
Bug: 117935272
Change-Id: Idacbf54bca4398079401b3a4a5a7cdd020a7263b