pinctrl: join dev_dbg strings into a single line

These are user-visible strings, so can exceed 80 columns.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
(cherry picked from commit ca67f10f

)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>