ARM: imx_v6_v7_defconfig: Select the PXP driver

The Pixel Pipeline (PXP) block is present on several i.MX SoCs
such as imx6dl, imx6sl, imx6ul, imx6sx, imx6ull and imx7d.

Select the PXP driver by default.
Signed-off-by: NFabio Estevam <festevam@gmail.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -257,6 +257,7 @@ CONFIG_VIDEO_MUX=y
 CONFIG_SOC_CAMERA=y
 CONFIG_V4L_MEM2MEM_DRIVERS=y
 CONFIG_VIDEO_CODA=m
+CONFIG_VIDEO_IMX_PXP=y
 # CONFIG_MEDIA_SUBDRV_AUTOSELECT is not set
 CONFIG_VIDEO_ADV7180=m
 CONFIG_VIDEO_OV5640=m