[media] blackfin Kconfig: select is evil; use, instead depends on

Select is evil as it has issues with dependencies. Better to convert
it to use depends on.

That fixes a breakage with out-of-tree compilation of the media
tree.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/blackfin/Kconfig

@@ -2,7 +2,6 @@ config VIDEO_BLACKFIN_CAPTURE
 	tristate "Blackfin Video Capture Driver"
 	depends on VIDEO_V4L2 && BLACKFIN && I2C
 	select VIDEOBUF2_DMA_CONTIG
-	select VIDEO_BLACKFIN_PPI
 	help
 	  V4L2 bridge driver for Blackfin video capture device.
 	  Choose PPI or EPPI as its interface.
@@ -12,3 +11,5 @@ config VIDEO_BLACKFIN_CAPTURE
 
 config VIDEO_BLACKFIN_PPI
 	tristate
+	depends on VIDEO_BLACKFIN_CAPTURE
+	default VIDEO_BLACKFIN_CAPTURE