V4L/DVB (6944): Fix in-kernel ivtv compilation

Due to tuner-xc2028.h, some extra directories should be added at .h search.
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/ivtv/Makefile

@@ -6,3 +6,8 @@ ivtv-objs	:= ivtv-routing.o ivtv-cards.o ivtv-controls.o \
 
 obj-$(CONFIG_VIDEO_IVTV) += ivtv.o
 obj-$(CONFIG_VIDEO_FB_IVTV) += ivtvfb.o
+
+EXTRA_CFLAGS += -Idrivers/media/video
+EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core
+EXTRA_CFLAGS += -Idrivers/media/dvb/frontends
+