feat(versal-net): add SDEI support

Add basic SDEI support with following configuration settings:
- SGI 8 as the source IRQ.
- Special Private event 0.
- One private and shared dynamic event used in tftf verification
  for SDEI support.
- SDEI support is off by default.

Change-Id: I7cfafb84c3fc053ec67258698cf749e63486fe18
Signed-off-by: Amit Nagal <amit.nagal@amd.com>
4 files changed