Add tracking of the last mouse position received, separate from the
click position. This allows callers to query the current mouse position
using mouse_get_pos() regardless of whether a click occurred.
The position is updated in mouse_get_event() for both motion and button
events, ensuring it always reflects the most recent mouse coordinates.
This avoid the problem of mouse_get_click() 'swallowing' motion events
so that a position change is not noticed, e.g. for showing a pointer.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
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