Draft: aarch64: Enable NVIDIA Jetson Xavier SoCs

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2098285

Upstream status: RHEL only

Testing: Booted on Xavier NX and AGX and verified basic network, pci, usb and mmc functionality

Add basic enablement for NVIDIA Jetson Xavier NX and AGX SoCs and devkit boards

Signed-off-by: Craig Magina cmagina@redhat.com