arch: mips: Kconfig: pedantic formatting

Formatting of Kconfig files doesn't look so pretty, so let the
Great White Handkerchief come around and clean it up.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-kernel@vger.kernel.org
Cc: hauke@hauke-m.de
Cc: zajec5@gmail.com
Cc: f.fainelli@gmail.com
Cc: bcm-kernel-feedback-list@broadcom.com
Cc: linux-mips@vger.kernel.org