xilinx: zynqmp: Extract aes operation into new file

xilinx: zynqmp: Extract aes operation into new file

This moves the aes operation that is performed by the pmu into a
separate file. This way it can be called not just from the shell
command, but also e.g. from board initialization code.

Signed-off-by: Christian Taedcke <christian.taedcke@weidmueller.com>
Link: https://lore.kernel.org/r/20230725072658.16341-1-christian.taedcke-oss@weidmueller.com
Signed-off-by: Michal Simek <michal.simek@amd.com>