input: synaptics: defer touch resume to workqueue for v2.6 driver

During device resume, the touch resume function is called after
display resume. Touch resume function will take about >200ms.
Defer the touch resume function to a workqueue to reduce the total
device resume time. An optional DT property is added to enable this
on targets that need this feature.

This change has been merged. Now, touch driver was updated to V2.6,
so, merge this change to V2.6 driver.

Change-Id: Ica477f35bd4fda59eb49c9b4f5e88b460366c761
Signed-off-by: zhaoyuan <yzhao@codeaurora.org>