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For M-profile the MVFR* ID registers are memory mapped, in the range we implement via the NVIC. Allow them to be read. (If the CPU has no FPU, these registers are defined to be RAZ.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20190416125744.27770-3-peter.maydell@linaro.org