input: synaptics: restrict sysfs node write permissions

Bug: 62800865
Change-Id: I4db40f172841306da4c14ffb649e59b3192e3fc7
Signed-off-by: Steve Pfetsch <spfetsch@google.com>

drivers/input/touchscreen/synaptics_dsx_htc_2.6/synaptics_dsx_rmi_dev.c

@@ -134,7 +134,7 @@ static struct device_attribute attrs[] = {
 	__ATTR(attn_state, S_IRUGO,
 			rmidev_sysfs_attn_state_show,
 			NULL),
-	__ATTR(pid, S_IRUGO | S_IRUGO | S_IWUSR | S_IWGRP,
+	__ATTR(pid, S_IRUGO | S_IRUGO | S_IWUSR,
 			rmidev_sysfs_pid_show,
 			rmidev_sysfs_pid_store),
 	__ATTR(term, S_IWUSR,