refactor(neoverse-rd): add defines for ROM, SRAM and DRAM2

In the current setup, the base and size of the ROM, SRAM, and DRAM2
regions are directly defined in the nrd_fw_def2.h file for N2 CPU based
platforms. To enhance modularity and appropriateness, introduce macros
for these definitions in the respective css file (nrd_css_def2.h). While
the maximum sizes for ROM, SRAM, and DRAM2 are specified in the css
specification, the actual implementation sizes may vary. Consequently,
relocate the size macros to the platform-specific platform_def.h file
for individual platforms.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: I30988bf63cf942f68188a70697cc43cb6af96a9c
3 files changed