BL2: Add support for MCUBOOT_USE_PSA_CRYPTO option

Add support in BL2 code to enable the cryptographic backend
to use PSA Crypto APIs through the option MCUBOOT_USE_PSA_CRYPTO

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: I3cb48e42d1666d46ed90a47e1f857a8679dea7d9
2 files changed