arm64: defconfig: Enable imx8mq-librem5-devkit display stack

Enable the panel, NWL DSI host controller and dphy. This
also needs the reset controller.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>