ARM: shmobile: lager: Select DRM_RCAR_DU in defconfig

A R-Car DU DRM device is registered for the Lager board, select the
corresponding driver in its defconfig.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/configs/lager_defconfig

@@ -89,6 +89,8 @@ CONFIG_THERMAL=y
 CONFIG_RCAR_THERMAL=y
 CONFIG_REGULATOR=y
 CONFIG_REGULATOR_FIXED_VOLTAGE=y
+CONFIG_DRM=y
+CONFIG_DRM_RCAR_DU=y
 # CONFIG_USB_SUPPORT is not set
 CONFIG_MMC=y
 CONFIG_MMC_SDHI=y