ARM: imx_v6_v7_defconfig: Select the CEC driver

Select CONFIG_DRM_DW_HDMI_CEC option, so that the CEC driver can be
loaded by default.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -250,6 +250,7 @@ CONFIG_IMX_IPUV3_CORE=y
 CONFIG_DRM=y
 CONFIG_DRM_PANEL_SIMPLE=y
 CONFIG_DRM_DW_HDMI_AHB_AUDIO=m
+CONFIG_DRM_DW_HDMI_CEC=y
 CONFIG_DRM_IMX=y
 CONFIG_DRM_IMX_PARALLEL_DISPLAY=y
 CONFIG_DRM_IMX_TVE=y