Replace secure storage with internal trusted storage

Merged Davidson Kumaresan requested to merge its-sp into master

Trusted Services had removed secure storage and added two new trusted services - Protected Storage and Internal Trusted Storage. Hence we are removing secure storage and adding support for the internal trusted storage.

Change-Id: I09a345de05b9165a7397ff6f58870109dd6edfcf Signed-off-by: Davidson K davidson.kumaresan@arm.com

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