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Rule 5.7: A tag name shall be a unique identifier

Follow convention of shorter names for smaller scope to fix
violations of MISRA rule 5.7

Fixed For:
    make ARM_TSP_RAM_LOCATION=tdram LOG_LEVEL=50 PLAT=fvp SPD=opteed

Change-Id: I5fbb5d6ebddf169550eddb07ed880f5c8076bb76
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>