ENGR00275033-1 mx6sl: pxp/v4l: port v4l2 output driver to 3.10

ENGR00275033-1 mx6sl: pxp/v4l: port v4l2 output driver to 3.10

port v4l2 output driver to 3.10 kernel

- replace .ioctl with .unlocked_ioctl
- add .vfl_dir flag - VFL_DIR_TX (newly introduced) for video_device
- drop __devinit,  __devexit, __exit and __exit_p
- replace mxc_elcdif_frame_addr_setup() with pxp_show_buf(), where pan_display
  be called due to the adoption of mxsfb.c from community
- change the fb id to be compared due to use new mxsfb.c
- mark the s_crop() and s_fbuf() third parameter const
- move local fbi variable to struct pxps
- use module_platform_driver()

Signed-off-by: Robby Cai <R63905@freescale.com>