refactor(neoverse-rd): move away from nrd_base_platform_def.h

The nrd_base_platform_def.h file includes CSS, RoS, firmware and
platform port related definitions. This approach of consolidating the
various definitions for multiple generation of platforms into the
nrd_base_platform_def.h file is not scaling well.

So in preparation of moving away from the use of nrd_base_platform_def.h
file for first generation of reference design platforms (A75/N1/V1),
split the definitions in this file into multiple include files. The new
files into which the definitions are refactored are -

- nrd_css_def1.h: includes CSS hardware related definitions
- nrd_css_fw_def1.h: includes CSS firmware 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 definitions that are only relavant to the first generation of
reference design platforms have been refactored from the
nrd_base_platform_def.h file.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: Ie730d913235221488c385f9ddf1da46a2b760816
9 files changed