samples/crypto: Use sys_log properly

Sys log already break a line after each line, by default, so removing
the '\n' on log messages.

Enabling support for sys log colors.

Change-Id: Ica3a601aba0bbbd2d9438b41fb7bca0aad9c05f4
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>