Merge /home/v4l/v4l/for_upstream

* /home/v4l/v4l/for_upstream:
  [media] Fix build when drivers are builtin and frontend modules
  [media] s5p makefiles: don't override other selections on obj-[ym]
  [media] exynos4-is: Fix FIMC-IS clocks initialization
  [media] rtl28xxu: fix buffer overflow when probing Rafael Micro r820t tuner

diff --cc drivers/media/platform/exynos4-is/fimc-is.c
Simple merge

diff --cc drivers/media/platform/exynos4-is/fimc-is.h
Simple merge

diff --cc drivers/media/usb/dvb-usb-v2/rtl28xxu.c
Simple merge