[media] media/staging: fix allyesconfig build error

Fix x86 allyesconfig builds.  Builds fail due to a non-static variable
named 'debug' in drivers/staging/media/as102/.

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Cc: Pierrick Hascoet <pierrick.hascoet@abilis.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>