ppc/pnv: remove pnv-phb3-root-port

The unified pnv-phb-root-port can be used in its place. There is no ABI
breakage in doing so because no official QEMU release introduced user
creatable pnv-phb3-root-port devices.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Frederic Barrat <fbarrat@linux.ibm.com>
Message-Id: <20220624084921.399219-8-danielhb413@gmail.com>
4 files changed