[media] msi3101: Kconfig select VIDEOBUF2_VMALLOC

[linuxtv-media:master 395/499] sdr-msi3101.c:undefined reference to
`vb2_vmalloc_memops'
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Signed-off-by: NAntti Palosaari <crope@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>

drivers/staging/media/msi3101/Kconfig

 config USB_MSI3101
 	tristate "Mirics MSi3101 SDR Dongle"
 	depends on USB && VIDEO_DEV && VIDEO_V4L2
+        select VIDEOBUF2_VMALLOC