arm64: defconfig: Enable LT8912B DRM bridge driver

This driver is used by the Nitrogen8 SBC.
Signed-off-by: NAdrien Grassein <adrien.grassein@gmail.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/configs/defconfig

@@ -701,6 +701,7 @@ CONFIG_DRM_PANEL_RAYDIUM_RM67191=m
 CONFIG_DRM_PANEL_SITRONIX_ST7703=m
 CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA=m
 CONFIG_DRM_DISPLAY_CONNECTOR=m
+CONFIG_DRM_LONTIUM_LT8912B=m
 CONFIG_DRM_NWL_MIPI_DSI=m
 CONFIG_DRM_LONTIUM_LT9611=m
 CONFIG_DRM_PARADE_PS8640=m