subsys/logging: log_backend_rb: Clear memory, timestamps

Add option to clear memory slot before writing logs, making reading
logs more easy.

Add timestamp logging option

Add option to enable timestamp for ring buffer backend. Timestamp may
consume little memory we have for ring buffer.

Add timestamp logging option

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
2 files changed