staging: drivers: pinctrl: Fixed checkpatch.pl warnings

This patch fixes two checkpatch.pl warnings

WARNING: Error trailing white space
WARNING: MIssing blank line after declaration

Signed-off-by: Anjana Sasindran <anjanasasindran123@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>