[media] drxk: Add a parameter for the microcode name

The microcode firmware provided on Terratec H5 seems to be
different. Add a parameter to allow specifying a different
firmware per-device.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb/frontends/drxk.h b/drivers/media/dvb/frontends/drxk.h
index d5b6f9f..dd54512 100644
--- a/drivers/media/dvb/frontends/drxk.h
+++ b/drivers/media/dvb/frontends/drxk.h
@@ -7,6 +7,7 @@
 struct drxk_config {
 	u8 adr;
 	u32 single_master : 1;
+	const char *microcode_name;
 };
 
 extern struct dvb_frontend *drxk_attach(const struct drxk_config *config,