V4L/DVB (12851): cx25821/Makefile: Cleanup

Remove an extra line that it is not needed
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/staging/cx25821/Makefile

@@ -12,5 +12,3 @@ EXTRA_CFLAGS += -Idrivers/media/video
 EXTRA_CFLAGS += -Idrivers/media/common/tuners
 EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core
 EXTRA_CFLAGS += -Idrivers/media/dvb/frontends
-
-EXTRA_CFLAGS += $(extra-cflags-y) $(extra-cflags-m)