V4L/DVB (4269): Subject: videocodec: make 1-bit fields unsigned

Make 1-bit bitfields unsigned.  Removes 68 sparse errors like these:
drivers/media/video/videocodec.h:225:17: error: dubious one-bit signed bitfield
drivers/media/video/msp3400-driver.h:93:32: error: dubious one-bit signed bitfield
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>