ASM: Restore CMAKE_ASM_COMPILER_ARCHITECTURE_ID persistence

Refactoring in commit 019f0f8b32 (ARCHITECTURE_ID: Save persistently
even if empty, 2025-03-13, v4.1.0-rc1~499^2~1) accidentally dropped
part of the variable name in `CMakeASMCompiler.cmake`.

Reported-by: Felipe Torrezan <felipe.torrezan@iar.com>
2 files changed