sh: sh2007: Modernize printing of kernel messages

  - Convert from printk() to pr_*(),
  - Add missing continuation.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Rich Felker <dalias@libc.org>