media: dvb-frontends: DUMMY_FE should depends on DVB_CORE

Using select for DVB_CORE doesn't work, as reported by
Randy:

CONFIG_I2C=m
CONFIG_DVB_CORE=y

ld: drivers/media/dvb-core/dvbdev.o: in function `dvb_module_probe':
dvbdev.c:(.text+0xf92): undefined reference to `i2c_new_client_device'
ld: dvbdev.c:(.text+0xffb): undefined reference to `i2c_unregister_device'
ld: drivers/media/dvb-core/dvbdev.o: in function `dvb_module_release':
dvbdev.c:(.text+0x107d): undefined reference to `i2c_unregister_device'

The problem is actually caused by the dummy frontend driver,
which uses select, and it is missing an I2C dependency:

WARNING: unmet direct dependencies detected for DVB_CORE
Depends on [m]: MEDIA_SUPPORT [=y] && MEDIA_DIGITAL_TV_SUPPORT [=y] && (I2C [=m] || I2C [=m]=n)
Selected by [y]:
- DVB_DUMMY_FE [=y] && MEDIA_SUPPORT [=y] && MEDIA_TEST_SUPPORT [=y]

As this is the only frontend driver using "select DVB_CORE",
change it do depends on DVB_CORE.

Reported-by: Randy Dunlap <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/dvb-frontends/Kconfig

···
 
 config DVB_DUMMY_FE
 	tristate "Dummy frontend driver"
-	depends on MEDIA_TEST_SUPPORT
-	select DVB_CORE
+	depends on MEDIA_TEST_SUPPORT && DVB_CORE
 	help
 	  Dummy skeleton frontend driver.