[media] xc5000: remove static dependencies on xc5000 created by previous changesets

convert the firmware configuration attach-time parameter from
a pointer to an integer so as to remove the static dependency
created by the previous changesets.

Signed-off-by: Michael Krufky <mkrufky@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>