pinctrl: sh-pfc: r8a7796: Fix IPSR and MOD_SEL register pin assignment for NDFC pins group

This patch fixes to set IPSR and MOD_SEL when using NFDATA{14,15}_A and
NF{RB,WP}_N_A pin function is selected. And renamess MOD_SEL2 bit22 value
definition name to SEL_NDFC.

This is a correction to the incorrect implementation of MOD_SEL register
pin assignment for R8A7796 SoC specification of R-Car Gen3 Hardware
User's Manual Rev.0.53E.

Fixes: f9aece73 ("pinctrl: sh-pfc: Initial R8A7796 PFC support")
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>