tinycrypt: Update TinyCrypt to version 0.2.5

TinyCrypt 0.2.5 was released a few hours ago:

https://github.com/01org/tinycrypt/releases/tag/v0.2.5



This patch updates some TinyCrypt files, solving the following issues:

- Decryptions using ccm mode can incorrectly fail
- Minor style issues in code documentation

Change-Id: I606cde179888aad7a52fd277d73973f2347d8882
Signed-off-by: Flavio Santes <flavio.santes@intel.com>