pinctrl: sh-pfc: r8a7796: Fix NFDATA{0..13} and NF{ALE,CLE,WE_N,RE_N} pin function definitions

This patch fixes the implementation incorrect of IPSR register value
definitions for NFDATA{0..13} and NF{ALE,CLE,WE_N,RE_N} pins function.

This is a correction to the incorrect implementation of IPSR register
pin assignment for R8A7796 SoC specification of R-Car Gen3 Hardware
User's Manual Rev.0.51E or later.

Fixes: f9aece73 ("pinctrl: sh-pfc: Initial R8A7796 PFC support")
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>