Write initial content of the display before blanking_off.
This allow faster update of the electronic ink displays as
the controller do not update the pannel when the banking
is enabled (currently this behaviour is only implemented
in gd7965 driver).
Signed-off-by: Johann Fischer <j.fischer@phytec.de>
Move LVGL sample from samples/gui/lvgl to samples/display/lvgl to have
a unified location for display related samples.
Signed-off-by: Jan Van Winkel <jan.van_winkel@dxplore.eu>