x86/amd_nb: Add new PCI ID for AMD family 1Ah model 20h

Add new PCI ID for Device 18h and Function 4.

Signed-off-by: Richard Gong <richard.gong@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Link: https://lore.kernel.org/r/20240913162903.649519-1-richard.gong@amd.com


Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>