neoverse-rd/rdv3: add support for second variant of the platform
The second variant of the RD-V3 platform has eight application cores and a 3x3 CMN mesh. The rest of the system is similar to the first variant of the platform.
Signed-off-by: Shriram K shriram.k@arm.com Change-Id: Ia3eda4fda9781a0b9e56c7e60f16b93fced64b90