ARM: imx_v6_v7_defconfig: Enable LVDS Display Bridge

Let IMX_LDB driver be built by default.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -217,6 +217,7 @@ CONFIG_MXS_DMA=y
 CONFIG_STAGING=y
 CONFIG_DRM_IMX=y
 CONFIG_DRM_IMX_TVE=y
+CONFIG_DRM_IMX_LDB=y
 CONFIG_DRM_IMX_FB_HELPER=y
 CONFIG_DRM_IMX_PARALLEL_DISPLAY=y
 CONFIG_DRM_IMX_IPUV3_CORE=y