Add gs2971 driver
board-mx6_nitrogen6x: add gs2971 support
gs2971: fix compiler warnings
board-mx6_bt: add gs2971 on spi bus 1
mxc_mipi_csi2: remove ipu/csi/v_channel, mipi camera will select this
board-mx6_bt: gs2971 updates
board-mx6_nitrogen6x.c: gs2971 updates
ipu_capture: add ipu_csi_window_size_crop for 861 timing mode of gs2971
mxc_v4l2_capture: add setup_ifparm with parameters to support gs2971 bt656(hync/vsyn) and bt.1120(eav/sav)
gs2971: cleanup/fixes