gst-fsl-plugins: fix build for kernel headers >= 3.10

This package couldn't build using a toolchain with kernel headers >=
3.10 because of the use of VIDIOC_DBG_G_CHIP_IDENT. As stated in
videodev2.h, this ioctl should never be used.

Signed-off-by: Gary Bisson <bisson.gary@gmail.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>