riscv: dts: sifive: Add fu740 topology information

[ Upstream commit bf6cd1c0 ]

The fu740 has no cpu-map node, so tools like hwloc cannot correctly
parse the topology. Add the node using the existing node labels.

Reported-by: Brice Goglin <Brice.Goglin@inria.fr>
Link: https://github.com/open-mpi/hwloc/issues/536


Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20220705190435.1790466-4-mail@conchuod.ie


Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>