media: remove unneeded header search paths

I was able to build without these extra header search paths.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

drivers/media/pci/bt8xx/Makefile

@@ -7,5 +7,4 @@ obj-$(CONFIG_VIDEO_BT848) += bttv.o
 obj-$(CONFIG_DVB_BT8XX) += bt878.o dvb-bt8xx.o dst.o dst_ca.o
 
 ccflags-y += -Idrivers/media/dvb-frontends
-ccflags-y += -Idrivers/media/common
 ccflags-y += -Idrivers/media/tuners