target-arm: Properly support EL2 and EL3 in arm_el_is_aa64()
Support EL2 and EL3 in arm_el_is_aa64() by implementing the logic for checking the SCR_EL3 and HCR_EL2 register-width bits as appropriate to determine the register width of lower exception levels. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com>
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