x86/amd_nb: Add support for Raven Ridge CPUs

Add Raven Ridge root bridge and data fabric PCI IDs.
This is required for amd_pci_dev_to_node_id() and amd_smn_read().

Cc: stable@vger.kernel.org # v4.16+
Tested-by: Gabriel Craciunescu <nix.or.die@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>