SST: Update crypto to return valid PSA SST errors

This patch updates the crypto interface implementation to return
correct psa_sst_err_t error codes when the mbedtls returns an error.

Change-Id: Iee59a578f52bd784095b510e901258c6856143f0
Signed-off-by: Marc Moreno <marc.morenoberengue@arm.com>
1 file changed