SMART — behaviour for multiple MSA or MSD rounds

In Section 2.3.3 it is unclear, how an ST should behave when multiple MSA or
MSD rounds have been received (e.g. because an MSA round was not received
correctly).
Thus the following paragraph should be added in Section 2.3.3:
"If multiple MSA rounds are received it should be assumed that some MSD
rounds got lost and thus the last MSA round is chosen. If multiple MSD
rounds are received it should be assumed that the intermediate MSA
rounds got lost and thus only the first MSD round is valid while the
remaining MSD rounds are dropped. Thus the system provides additional
resistance against unintended operations because of missed MSA or MSD
rounds."

Accept changes as proposed.