V4L/DVB (6853): xc2028: check HAS_IF flag against table

When searching for the right S-Code table to load, check the HAS_IF flag
against the firmware we are checking instead of against the the "type"
requested.  We already ignore the scode type requested if the caller passed
an int_freq; this makes the search by frequency consistent with that behaviour.

Signed-off-by: Chris Pascoe <c.pascoe@itee.uq.edu.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>