[media] au0828: Add suspend code for DVB

The scheduled work should be cancelled during suspend.

At resume time, we need to set the frontend again. So,
add such logic to the driver.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --cc drivers/media/usb/au0828/au0828-core.c
Simple merge

diff --cc drivers/media/usb/au0828/au0828-dvb.c
Simple merge

diff --cc drivers/media/usb/au0828/au0828.h
Simple merge