input: touchscreen: add auto fw upgrade for ITE tech driver

Add auto firmware and config upgrade functionality for ITE tech
touchscreen driver.
Add sysfs support for manual fw and cfg upgrade functionality.
Also clean the sysfs function names.

This is propagation gerrit for 8909w bring up.

Change-Id: I8912545589cb763c1deb70bebb081e920af69ad2
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>