[media] cx88: fix build when VP3054=m and CX88_DVB=y

As reported by Jim Davis <jim.epost@gmail.com>:

randconfig build error with next-20130813, in drivers/media/pci/cx88,
when:
	CONFIG_VIDEO_CX88=y
	CONFIG_VIDEO_CX88_BLACKBIRD=m
	CONFIG_VIDEO_CX88_DVB=y
	CONFIG_VIDEO_CX88_VP3054=m
	CONFIG_VIDEO_CX88_MPEG=y

  LD      init/built-in.o
drivers/built-in.o: In function `cx8802_dvb_remove':
cx88-dvb.c:(.text+0x3a9914): undefined reference to `vp3054_i2c_remove'
drivers/built-in.o: In function `cx8802_dvb_probe':
cx88-dvb.c:(.text+0x3a9c4b): undefined reference to `vp3054_i2c_probe'
make: *** [vmlinux] Error 1

That happens because the vp3054 symbols aren't available builtin.
So, make it builtin, if CX88_DVB=y, or module otherwise, if this
support is selected.
Reported-by: Jim Davis <jim.epost@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/pci/cx88/Kconfig

@@ -72,9 +72,9 @@ config VIDEO_CX88_DVB
 	  To compile this driver as a module, choose M here: the
 	  module will be called cx88-dvb.
 
-config VIDEO_CX88_VP3054
-	tristate "VP-3054 Secondary I2C Bus Support"
-	default m
+config VIDEO_CX88_ENABLE_VP3054
+	bool "VP-3054 Secondary I2C Bus Support"
+	default y
 	depends on VIDEO_CX88_DVB && DVB_MT352
 	---help---
 	  This adds DVB-T support for cards based on the
@@ -82,6 +82,11 @@ config VIDEO_CX88_VP3054
 	  which also require support for the VP-3054
 	  Secondary I2C bus, such at DNTV Live! DVB-T Pro.
 
+config VIDEO_CX88_VP3054
+	tristate
+	depends on VIDEO_CX88_DVB && VIDEO_CX88_ENABLE_VP3054
+	default y
+
 config VIDEO_CX88_MPEG
 	tristate
 	depends on VIDEO_CX88_DVB || VIDEO_CX88_BLACKBIRD