rust: pci: add DeviceId::from_class_and_vendor() method

rust: pci: add DeviceId::from_class_and_vendor() method

Add a new method to create PCI DeviceIds that match both a specific
vendor and PCI class. This is more targeted than the existing
from_class() method as it filters on both vendor and class criteria.

Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Elle Rhumsaa <elle@weathered-steel.dev>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/r/20250829223632.144030-4-jhubbard@nvidia.com
[ Minor doc-comment improvements. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>