This patch fixes two issues in the coordinate handling of the
`zephyr,lvgl-pointer-input` compatible:
- If the swap-xy flag is set the coordinates need to be swapped even
before the sync event is received.
- The coordinates are stored into an additional variable instead of the
pending_event. This is done to prevent the double inversion for touch
release events.
Resolves issue #70539.
Signed-off-by: Fabian Blatz <fabianblatz@gmail.com>