Make the touchscreen work on samsung-gts210vewifi

Created by: k-laus

touchscreen works now :-) Had to use ATTRS{name}=="sec_touchscreen" instead of ENV{DEVNAME}=="/dev/input/event2" which solved

1. detection problem on cold-booting: touchscreen was not detected/activated at all, only was activated if booted via TWRP Reboot>System
2. touchscreen was falsely detected as touchpad

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[x] Merge on GitHub (see https://postmarketos.org/merge)

aports/device/device-samsung-gts210vewifi/90-sec_touchscreen.rules

+# * need ATTRS{name}=="sec_touchscreen" else device not detected as touchscreen
+# * give size hint (in mm) otherwise too small size is assumed
+# * to avoid palm detection, need LIBINPUT_ATTR_PALM_PRESSURE_THRESHOLD=256 
+#   and libinput>1.10
+# * set calibration matrix for 270 degree clockwise rotation, see [1]
+# * remove TOUCHPAD, add TOUCHSCREEN to ensure that device is seen as 
+#   touchscreen only, see [2]
+#
+# [1] https://wayland.freedesktop.org/libinput/doc/latest/udev_config.html
+# [2] https://wayland.freedesktop.org/libinput/doc/latest/udev_config.html#udev_device_type
+#
+ACTION=="add|change", SUBSYSTEM=="input", ATTRS{name}=="sec_touchscreen", \
+ENV{LIBINPUT_ATTR_SIZE_HINT}="190x140", \
+ENV{LIBINPUT_ATTR_PALM_PRESSURE_THRESHOLD}="256", \
+ENV{LIBINPUT_CALIBRATION_MATRIX}="0 1 0 -1 0 1", \
+ENV{ID_INPUT}="1", \
+ENV{ID_INPUT_TOUCHPAD}="", \
+ENV{ID_INPUT_TOUCHSCREEN}="1"