pinctrl: sh-pfc: Fix overly long lines

The PORT_GP_CFG_<n>() macros take up more than 80 columns -- and not for
a good reason. Make the header file checkpatch.pl-proof at least in this
respect...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>