[media] usb: pvrusb2: pvrusb2-hdw: Remove unused function

Remove the function pvr2_hdw_cmd_powerdown() that is not used anywhere.

This was partially found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --cc drivers/media/usb/pvrusb2/pvrusb2-hdw.c
Simple merge

diff --cc drivers/media/usb/pvrusb2/pvrusb2-hdw.h
Simple merge