configs/tools: Exclude MSI-X table from memory regions

configs/tools: Exclude MSI-X table from memory regions

We need to virtualize the access to the MSI-X table, thus we have to
prevent that the cells access them directly. As the table may be
embedded into a larger BAR, specifically followed by the PBA, split up
the BAR region as required.

Update the QEMU config accordingly - currently the only config with
MSI-X devices.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>