While the tests in this testcase are for the log subsystem they are only
able to be run if CONFIG_CMD_LOG is enabled as well as CONFIG_LOG, so
update the buildconfigspec requirement.

Signed-off-by: Tom Rini <trini@konsulko.com>

When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>

Add a test of the 'log format' and 'log rec' commands. This also covers
things like log_get_cat_by_name(), since they are used by these commands.
Fix a style nit in the tests also.

Signed-off-by: Simon Glass <sjg@chromium.org>

At present this just outputs the message. Update it to output whatever the
format requests.

Signed-off-by: Simon Glass <sjg@chromium.org>

Add a test which tries out various filters and options to make sure that
logging works as expected.

Signed-off-by: Simon Glass <sjg@chromium.org>