refactor(neoverse-rd): refactor nrd_soc_platform_def.h file

Continuing the refactoring of the various definitions for the first
generation of platforms (A75/N1/V1), refactor the definitions in the
nrd_soc_platform_def.h file into the following files as appropriate.

- nrd_ros_def1.h: includes RoS hardware related definitions
- nrd_ros_fw_def1.h: includes RoS firmware related definitions
- nrd_plat_arm_def1.h: includes platform port related definitions

RoS (Rest Of System) is used to refer to the part of the reference
design platform that excludes CSS.

The file inclusions in the platform_def.h file of the platforms have
been updated accordingly.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: I081d2a225a32c15f65d8d86f81104ba12d284406
10 files changed