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Ensure (where possible) that switch statements in bl1 comply with MISRA
rules 16.1 - 16.7

Return statements inside switch clauses mean that we do not comply with
rule 16.3.

Change-Id: I8342389ba525dfc68b88e67dbb3690a529abfeb1
Signed-off-by: Jonathan Wright <jonathan.wright@arm.com>