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>
Gabriel Valcazar