[media] xc4000: add code to do standard and scode firmware loading

Add code to handle firmware blobs for the standard and scode.  Note there
appears to be some issue with loading the DTV8 standard firmware, probably
related to direct/indirect mode.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>