feat(rdn2): add support for tftf

Add tftf support for Neoverse Reference Design RD-N2 platform. The RD-N2
platform includes 16 Neoverse N2 CPUs, CMN-700 interconnect, GIC-700 and
SMMU-700.

Signed-off-by: Shriram K <shriram.k@arm.com>
Change-Id: I48802aa6b02bb14d399a61b7c9008572db6d52fc
4 files changed