V4L/DVB (4958): Fix namespace conflict between w9968cf.c on MIPS

Both use __SC.  Since __* is sort of private namespace I've choosen to fix
this in the driver.  For consistency I decieded to also change __UNSC to
UNSC.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>