Build: Correct the description of Crypto config

This patch corrects the description of crypto service
config parameters and also sets the correct default for
CRYPTO_ENGINE_BUF_SIZE config.

Signed-off-by: Soby Mathew <soby.mathew@arm.com>
Change-Id: I5552ab0ce0bafaf14752fdca4714d41956c7bb43
2 files changed