target/arm: Define new fp_status_a32 and fp_status_a64

We want to split the existing fp_status in the Arm CPUState into
separate float_status fields for AArch32 and AArch64.  (This is
because new control bits defined by FEAT_AFP only have an effect for
AArch64, not AArch32.) To make this split we will:
 * define new fp_status_a32 and fp_status_a64 which have
   identical behaviour to the existing fp_status
 * move existing uses of fp_status to fp_status_a32 or
   fp_status_a64 as appropriate
 * delete the old fp_status when it has no uses left

In this patch we add the new float_status fields.

We will also need to split fp_status_f16, but we will do that
as a separate series of patches.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250124162836.2332150-7-peter.maydell@linaro.org

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