refactor(neoverse-rd): move defines out of platform_def.h

Presently, the second generation platforms have direct references to CSS
and ROS specific addresses within RD-N2's platform header file
(platform_def.h).  Moreover, there are platform port specific macros
defined within platform_def.h To enhance organization and
appropriateness, relocate these definitions to nrd_css_def2.h,
nrd_ros_def2.h and nrd_arm_platform_def1.h files accordingly.  Reuse
these definitions within the platform_def.h files as needed.

Additionally, remove reference to the unused PLAT_ARM_GICC_BASE macro
from the individual platform_def.h file.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: I9a237c3ae28d7e209188e2c37c8494b4a420ee83
3 files changed