target/arm: Report M-profile alignment faults correctly to the guest

For M-profile, we weren't reporting alignment faults triggered by the
generic TCG code correctly to the guest.  These get passed into
arm_v7m_cpu_do_interrupt() as an EXCP_DATA_ABORT with an A-profile
style exception.fsr value of 1.  We didn't check for this, and so
they fell through into the default of "assume this is an MPU fault"
and were reported to the guest as a data access violation MPU fault.

Report these alignment faults as UsageFaults which set the UNALIGNED
bit in the UFSR.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210723162146.5167-4-peter.maydell@linaro.org

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