input: synaptics_i2c_rmi4: Check configuration after reset

After resuming from suspend, configuration may be lost.  Check
"Unconfigured" bit and if it is set, reconfigure the device.

Change-Id: Id55cc3a7f1c6e0885fa6b186696eab86a18103a7
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>