refactor(neoverse_rd): introduce flash and ros macros

As part of the refactoring for TFTF on the first and second
generation of platforms, introduce flash related memory layout
macros to be added in nrd_ros_def1.h and nrd_ros_def2.h files.

Signed-off-by: Jerry Wang <Jerry.Wang4@arm.com>
Change-Id: I01929bbd465d777e827c3eb547bb973339bd4308
4 files changed