[media] dvb_usb_v2: change rc polling active/deactive logic

Use own flag to mark when rc polling is active/deactive and make
decisions, like start/stop polling on suspend/resume, against that.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --cc drivers/media/usb/dvb-usb-v2/dvb_usb.h
Simple merge

diff --cc drivers/media/usb/dvb-usb-v2/dvb_usb_core.c
Simple merge