arm: Don't let no-MPU PMSA cores write to SCTLR.M
If the CPU is a PMSA config with no MPU implemented, then the SCTLR.M bit should be RAZ/WI, so that the guest can never turn on the non-existent MPU. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NAlistair Francis <alistair.francis@xilinx.com> Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 1493122030-32191-7-git-send-email-peter.maydell@linaro.org
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