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At this stage of development Non Volatile counters are not implemented
in the Diphda platform.

This commit disables their use during the Trusted Board Boot by
overriding the NV counters get/set functions.

Change-Id: I8dcbebe0281cc4d0837c283ff637e20b850988ef
Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>