V4L/DVB (4485): Fix a warning on PPC64

drivers/media/video/pvrusb2/pvrusb2-i2c-cmd-v4l2.c: In function 'set_standard':
drivers/media/video/pvrusb2/pvrusb2-i2c-cmd-v4l2.c:33: warning: format '%llx' expects type 'long long unsigned int', but argument 2 has type 'v4l2_std_id'

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>