Node names should be generic.

Improve the binding example by using 'touchscreen' as the node name.
Signed-off-by: Fabio Estevam <festevam@denx.de>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240830194331.3774408-1-festevam@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>