fix(psa): increase psa-mbedtls heap size for rsa

The value assigned for the mbedtls heap size for large
rsa keys was too small when PSA_CRYPTO is set to 1,
leading to run-time failures if one was to attempt
to use a large RSA key with PSA_CRYPTO=1.

Change-Id: Id9b2648ae911879f483f1b88301f28694af0721d
Signed-off-by: Ryan Everett <ryan.everett@arm.com>
3 files changed