udev: don't reference parent sysfs node directly

udev warns direct reference to parent sysfs, which is not necessary and
may break future kernel. Actually udev will handle parent nodes automatically
for ATTRS key.

This fixes [BUGID #113]

Signed-off-by: Kevin Tian <kevin.tian@intel.com>

meta/recipes-core/udev/udev-158/local.rules

@@ -28,6 +28,5 @@ KERNEL=="rtc0", SYMLINK+="rtc"
 ACTION=="add", DEVPATH=="/devices/*", ENV{MODALIAS}=="?*", RUN+="/sbin/modprobe $env{MODALIAS}"
 
 # Create a symlink to any touchscreen input device
-# Need to use ../ so the eventX can find the parent inputX modalias which is a directory above
-SUBSYSTEM=="input", KERNEL=="event[0-9]*", ATTRS{../modalias}=="input:*-e0*,3,*a0,1,*18,*", SYMLINK+="input/touchscreen0"
+SUBSYSTEM=="input", KERNEL=="event[0-9]*", ATTRS{modalias}=="input:*-e0*,3,*a0,1,*18,*", SYMLINK+="input/touchscreen0"
 

meta/recipes-core/udev/udev_158.bb

@@ -1,3 +1,3 @@
 include udev-new.inc
 
-PR = "r2"
+PR = "r3"