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There are no references to AARCH32, AARCH64 and
__ASSEMBLY__ macros in the TF-A code hence
removed the deprecated information mentioning about
these macros in the document.

Change-Id: I472ab985ca2e4173bae23ff7b4465a9b60bc82eb
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>