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MPS3 boards have an extra SWITCH register in the FPGAIO block which reports the value of some switches. Implement this, governed by a property the board code can use to specify whether whether it exists. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210215115138.20465-7-peter.maydell@linaro.org