media: cxd2880: Makefile: remove an include

It is not needed anymore to include the dvb-core directory,
as all the public headers that used to be there was moved
to include/media.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/cxd2880/Makefile

@@ -15,5 +15,4 @@ cxd2880-objs := cxd2880_common.o \
 
 obj-$(CONFIG_DVB_CXD2880) += cxd2880.o
 
-ccflags-y += -Idrivers/media/dvb-core
 ccflags-y += -Idrivers/media/dvb-frontends