cl/driver: fix the incorrect handling of 1D array.

cl/driver: fix the incorrect handling of 1D array.

According to the bspec, the 1D array should be treated as a 3D like
surface which has height 1. So we need to make sure the depth is
the array_size. Thus the rt_view_extent's value should be always
the same as the depth.

According to the ocl spec, the 1D array firstly should be a 1D image rather
than a 2D image. Thus we should access different lines according to the
slice_pitch rather than the image_row_pitch.

Signed-off-by: Zhigang Gong <zhigang.gong@intel.com>
Reviewed-by: He Junyan <junyan.he@inbox.com>