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b0cb4e5968
Rename arm64_addrenv.c to arm64_addrenv_mmu.c to separate MMU-specific logic. Add new arm64_addrenv_mpu.c with stub implementations of address environment functions for MPU-based systems. Enable address environment support in FVP ARMv8-R Kconfig to support kernel stacks in protected mode. Conditionally build MPU or MMU address environment code based on CONFIG_ARCH_USE_MMU/CONFIG_ARCH_USE_MPU. Signed-off-by: hujun5 <hujun5@xiaomi.com>