target/arm: Use TRAP_UNCATEGORIZED for XScale CPAR traps

On XScale CPUs, there is no EL2 or AArch64, so no syndrome register.
These traps are just UNDEFs in the traditional AArch32 sense, so
CP_ACCESS_TRAP_UNCATEGORIZED is more accurate than CP_ACCESS_TRAP.
This has no visible behavioural change, because the guest doesn't
have a way to see the syndrome value we generate.

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: 20250130182309.717346-12-peter.maydell@linaro.org

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