Right now MSIs don't work on the Qualcomm Snapdragon X Elite (X1E80100).

Right now MSIs don't work on the Qualcomm Snapdragon X Elite (X1E80100).
This is the first and only platform so far where we have seen larger devbits
than we can initially support.  For now, stop registering the MSI controller
if we encounter this.  With this, PCIe devices use SPIs and work correctly.
At some point we can hopefully rip this thing out again.

ok kettenis@