V4L/DVB (4611): Add module-init-tools version comment.

I've just determined that module-init-tools >=3.2 is needed for dvb_attach
to work. This adds a comment to Kconfig about it.
Signed-off-by: NAndrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/dvb-core/Kconfig

@@ -19,4 +19,6 @@ config DVB_CORE_ATTACH
 	  allow the card drivers to only load the frontend modules
 	  they require. This saves several KBytes of memory.
 
+	  Note: You will need moudule-init-tools v3.2 or later for this feature.
+
 	  If unsure say Y.