V4L/DVB (3806): Cx88-blackbird: allow proper detection of PAL vs. NTSC video standard

- removed test for CX88_BOARD_HAUPPAUGE_ROSLYN prior to determining whether
  the video standard in use is NTSC or PAL.
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>