input: synaptics_i2c_rmi4: Enable power saving in suspend mode

Enable power saving in suspend cycle by turning off regulators and
disabling gpios.  Remove software reset on resume so that
active mode power numbers are not impacted.

CRs-fixed: 543944
Change-Id: I1929913691c45693f647a5c4bc08e0fbb85a3ad4
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>