platform/x86: touchscreen_dmi: Add info for the Chuwi Hi8 Air tablet

Add touchscreen platform data for the Chuwi Hi8 Air tablet.

Signed-off-by: Kai Renzig <k.renzig@gmail.com>
[andy: fixed driver name and rewrote subject]
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>