feat(neoverse-rd): Add support plarform RD-V3-R1

Add board support for RD-V3-R1 platform, which is a dual chip variant.
Each chip has reduced core count of 14 CPUs.

Signed-off-by: Joel Goddard <joel.goddard@arm.com>
Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
Signed-off-by: Lokesh B V <Lokesh.BV@Arm.com>
Change-Id: Iaf26bc901245712e525cace18c47657d6cd78ef3

(feat)neoverse_rd/rdv3r1: Increase core count to 14 per chip

Signed-off-by: Lokesh B V <Lokesh.BV@Arm.com>
Change-Id: Ice4b48f6ed54730b183733ac55ae03a8451064a7