drm/omap: panel-lgphilips-lb035q02: Add note for incorrect data drive edge and DE level

According to the datasheet of the panel, both data, DEN and sync signals
are expected to be driven on the falling edge of the DOTCLK.
The DE is active low according to the documentation.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>