Drop the --cxl= option and unconditionally enable cxl=on the QEMU machine type whenever the host architecture supports it (x86_64 and aarch64). The flag was only added for testing parity with mkosi's CXL= setting and there is no reason to leave it as an opt-in toggle: with no pxb-cxl device or cxl-fmw window attached, enabling it on the machine only reserves a small MMIO region and emits an empty CEDT, so the cost is negligible while removing one knob users would otherwise have to flip explicitly to exercise the CXL code paths in QEMU.
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