input: touchscreen: Change the file system permission of synaptic driver

Some of the sysfs files of synaptic driver has "write"
permissions. Change them to "read" only.

Change-Id: I1454e30f06532f324707d0140ed990551259a3ea
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>
Merge "input: touchscreen: Change the file system permission of synaptic driver"