target/arm: Move aarch64 CPU property code to TYPE_ARM_CPU

The only thing we have left in the TYPE_AARCH64_CPU class that makes
it different to TYPE_ARM_CPU is that we register the handling of the
"aarch64" property there.

Move the handling of this property to the base class, where we make
it a property of the object rather than of the class, and add it
to the CPU if it has the ARM_FEATURE_AARCH64 property present at
init.  This is in line with how we handle other Arm CPU properties,
and should not change which CPUs it's visible for.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250429132200.605611-6-peter.maydell@linaro.org

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