input: synaptics_dsx: fix data sysfs read-write permission

Change the data sysfs file read-write permissions to
RW permission to user and R permission to group and
world.

Change-Id: I8f2d3da1f491d6ee63fc6ed6e33de12f1a4bc282
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>