input: touchscreen: reduce lpm current of avdd reg for ITE tech

Reduce lpm current of avdd regulator for ITE tech touch controller
to save power dissipation in lpm state.

Change-Id: I4b0c532096f1555561ad33e937cb947e85f987cd
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>