UBUNTU: SAUCE: Input: synaptics - add Intertouch support on X1 Carbon 6th and X280

UBUNTU: SAUCE: Input: synaptics - add Intertouch support on X1 Carbon 6th and X280

BugLink: http://bugs.launchpad.net/bugs/1723986
Link: https://patchwork.kernel.org/patch/10008513/
Synaptics devices reported it has Intertouch support,
and it fails via PS/2 as following logs:

psmouse serio2: Failed to reset mouse on synaptics-pt/serio0
psmouse serio2: Failed to enable mouse on synaptics-pt/serio0

Set these new devices to use SMBus to fix this issue,
then they report SMBus version 3 is using,
patch: https://patchwork.kernel.org/patch/9989547/ enabled SMBus ver 3 and
makes synaptics devices work fine on SMBus mode.

Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Acked-by: Hui Wang <hui.wang@canonical.com>
Acked-by: AceLan Kao <acelan.kao@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>