This change isn't functional, but necessary if we want to be able to separate
the logic in the include file and the demo recipe. This way the include file is
agnostic and can be included into other recipes if needed.
Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>
Rename the recipe to lvgl-demo to reflect the generalization and select the
most appropriate backend for each platform. Aside from making sure each backend
builds and runs fine, add some usability improvements:
* Specify the mouse as the default evdev device instead of the touchscreen
* Use common resolution variables to be able to configure the app's
dimensions easily
https://onedigi.atlassian.net/browse/DEL-8740
Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>