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This patch renames MBEDTLS_KEY_ALG to TF_MBEDTLS_KEY_ALG. This
completes the migration of TF specific macros so that they do not
have the MBEDTLS_ suffix (see arm-trusted-firmware#874).

Change-Id: Iad7632477e220b0af987c4db3cf52229fb127d00
Signed-off-by: David Cunado <david.cunado@arm.com>