kdb: Re-factor kdb_printf() message write code

Re-factor kdb_printf() message write code in order to avoid duplication
of code and thereby increase readability.

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/1591264879-25920-2-git-send-email-sumit.garg@linaro.org


Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>