log: Add a test command

Add a command which exercises the logging system.

Change-Id: I4eb139b69937c752d7f6fc42dde3f757260b832b
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Kever Yan

log: Add a test command

Add a command which exercises the logging system.

Change-Id: I4eb139b69937c752d7f6fc42dde3f757260b832b
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
(cherry picked from commit ef11ed8239bf02b347e7fb9fc6d980aec0c7810a)

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