feat(auth): increase mbedtls heap for PSA RSA

Increase default mbedtls PSA crypto heap size for key id management
redesign where the key information is stored for reuse during
verification and needs more heap size for RSA keys.

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: I3afe0107a8e22ededd3eb4c0e1f635f18960d341
1 file changed