Category and level both use an enum for their ID values. Add functions to
convert these IDs to strings and vice versa. This will allow the log to
output the strings instead of the (inscrutable) values.

At the same time, add a new 'driver-model' category, to cover core
driver-model functions and fix an incorrect value for LOGL_MAX.

Tests will be added with the new 'log' subcommands.
Signed-off-by: NSimon Glass <sjg@chromium.org>
(Updated to correct clang warnings)

Set up logging both before and after relocation.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>

Add the logging header file and implementation with some configuration
options to control it.
Signed-off-by: NSimon Glass <sjg@chromium.org>