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dtb: santino: Remove SIS touch

Jonas Höppner requested to merge dtb-remove-sis-touch into linux-5.4.23-guf

Remove the SIS touch entry from the device tree include file: SANTINO supports various touches and touches should be defined at installation time.

Because of this variations we should not define the touch controller in hard-coded base device trees. Instead we use device tree overlays to define the used touches.

We devised a mechanism that reads the legacy Garz & Fricke specific XML data and generates a device tree from this info using a tool called gfxml2dto. Using this mechanism during installation time we can overlay the base device tree with the correct touch information.

Thus it is not useful anymore to define touches in the base device tree.

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