Merge changes from topic "nrd2_refactor" into integration
* changes:
feat(docs): update maintainer list for neoverse_rd
refactor(neoverse-rd): remove soc_css.mk from common makefile
refactor(neoverse-rd): unify GIC SPI range macros
refactor(neoverse-rd): clean-up nrd_plat_arm_def2.h file
feat(neoverse-rd): disable SPMD_SPM_AT_SEL2 for N2/V2 platforms
feat(rdn2): enable AMU if present on the platform
feat(rdn2): enable MTE2 if present on the platform
refactor(neoverse-rd): move defines out of platform_def.h
refactor(neoverse-rd): add defines for ROM, SRAM and DRAM2
refactor(neoverse-rd): define naming convention for RoS macros
refactor(neoverse-rd): define naming convention for CSS macros
refactor(neoverse-rd): refactor mmap macro for RoS device memory region
refactor(neoverse-rd): refactor mmap macro for CSS device memory region
refactor(neoverse-rd): set mmap naming convention
refactor(neoverse-rd): rename nrd_plat_v2.c to align with convention
refactor(neoverse-rd): refactor nrd_soc_css_def_v2.h file
refactor(neoverse-rd): refactor nrd_soc_platform_def_v2.h file
refactor(neoverse-rd): refactor nrd_base_platform_def.h
refactor(neoverse-rd): header files for second generation platforms