BL2: Enable ECDSA signature verification

Add the option to use ECDSA signature verification
with PSA Crypto for MCUboot by setting the
MCUBOOT_SIGNATURE_TYPE to EC-P256 / EC-P384 and enabling
MCUBOOT_USE_PSA_CRYPTO in the CMake configuration.
Updating the MCUBOOT_VERSION to have:

- ECDSA signature verification using the PSA Crypto API,
- ECDSA-P384 support.

Signed-off-by: Roland Mikhel <roland.mikhel@arm.com>
Change-Id: Ida24010ca043081743712c75c3a8fe616f61c127
15 files changed