File crypto_legacy.h

Add temporary suppport for deprecated symbols before they are removed from the library.

PSA_WANT_KEY_TYPE_xxx_KEY_PAIR and MBEDTLS_PSA_ACCEL_KEY_TYPE_xxx_KEY_PAIR symbols are deprecated. New symols add a suffix to that base name in order to clearly state what is the expected use for the key (use, import, export, generate, derive). Here we define some backward compatibility support for uses stil using the legacy symbols.