Comment 2 for bug 1305522

From Synaptics engineer, we not only need
   9fb6bf0 HID: rmi: introduce RMI driver for Synaptics touchpads
but also need
   9b5a9ae HID: i2c-hid: implement ll_driver transport-layer callbacks

The second commit depends on other hid commits that have been introduced in 3.14 kernel.
Need more time to clean up the dependency, and cherry pick those commits