dma: xilinx: Add interlaced support to Xilinx Framebuffer driver

dma: xilinx: Add interlaced support to Xilinx Framebuffer driver

Adds support for reading or setting the field id of framebuffer written
to memory or read back from memory in the Xilinx Framebuffer driver.

Signed-off-by: Vishal Sagar <vsagar@xilinx.com>
Reviewed-by: Hyun Kwon <hyun.kwon@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>