Fix warnings reported by UBSAN
fixed the following warnings reported by UBSAN:
- modules/crypto/tinycrypt/lib/source/aes_encrypt.c:93:8: runtime error: left shift of 251 by 24 places cannot be represented in type ‘int’
2)modules/crypto/tinycrypt/lib/source/aes_encrypt.c:86:25: runtime error: left shift of 250 by 24 places cannot be represented in type ‘int’
Signed-off-by: Ivan Iushkov ivan.iushkov@nordicsemi.no