The old omapdrm panels got removed for v5.4 in favor of generic panels,
and the Kconfig options changed. Let's update omap2plus_defconfig
accordingly so the same panels are still enabled.

Cc: Jyri Sarha <jsarha@ti.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>