zynq: dts: Remove xylon snipset

It is available already available in trd dts
and none is using this file.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
xilinx: arm: i2c: add support for graceful exit

Changes the blocking completion call to non-blocking
using the timeout variant of wait_for_completion.

Signed-off-by: Suneel Garapati <suneelg@xilinx.com>
Tested-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>