[media] media: platform: pxa_camera: convert to vb2

Convert pxa_camera from videobuf to videobuf2.

As the soc_camera was already compatible with videobuf2, the port is
quite straightforward.

The special case of this code in which the vb2 to prepare is "too
big" in terms of size for the new capture format, the pxa_camera will
fail.
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/soc_camera/Kconfig

@@ -19,8 +19,8 @@ config SOC_CAMERA_PLATFORM
 
 config VIDEO_PXA27x
 	tristate "PXA27x Quick Capture Interface driver"
-	depends on VIDEO_DEV && PXA27x && SOC_CAMERA
-	select VIDEOBUF_DMA_SG
+	depends on VIDEO_DEV && PXA27x && SOC_CAMERA && HAS_DMA
+	select VIDEOBUF2_DMA_SG
 	select SG_SPLIT
 	---help---
 	  This is a v4l2 driver for the PXA27x Quick Capture Interface