media: pvrusb2: VIDEO_PVRUSB2 depends on DVB_CORE to use dvb_* symbols

A rand config causes this link error
vmlinux.o: In function `pvr2_dvb_create':
(.text+0x8af1d2): undefined reference to `dvb_register_adapter'

The rand config has
CONFIG_VIDEO_PVRUSB2=y
CONFIG_VIDEO_DEV=y
CONFIG_DVB_CORE=m

VIDEO_PVRUSB2 should also depend on DVB_CORE.
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/usb/pvrusb2/Kconfig

 # SPDX-License-Identifier: GPL-2.0-only
 config VIDEO_PVRUSB2
 	tristate "Hauppauge WinTV-PVR USB2 support"
-	depends on VIDEO_DEV && I2C
+	depends on VIDEO_DEV && I2C && DVB_CORE
 	select VIDEO_TUNER
 	select VIDEO_TVEEPROM
 	select VIDEO_CX2341X