V4L/DVB (3337): Drivers/media/dvb/frontends/mt312.c: cleanups

This patch contains the following possible cleanups:
- update the Kconfig help to mention the VP310
- merge vp310_attach and mt312_attach into a new vp310_mt312_attach
  to remove some code duplication

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/dvb/frontends/Kconfig b/drivers/media/dvb/frontends/Kconfig
index 76b6a2a..c676b1e 100644
--- a/drivers/media/dvb/frontends/Kconfig
+++ b/drivers/media/dvb/frontends/Kconfig
@@ -29,7 +29,7 @@
 	  A DVB-S tuner module. Say Y when you want to support this frontend.
 
 config DVB_MT312
-	tristate "Zarlink MT312 based"
+	tristate "Zarlink VP310/MT312 based"
 	depends on DVB_CORE
 	help
 	  A DVB-S tuner module. Say Y when you want to support this frontend.