pinctrl: sh-pfc: Update info pointer after SoC-specific init

Update the sh_pfc_soc_info pointer after calling the SoC-specific
initialization function, as it may have been updated to e.g. handle
different SoC revisions.  This makes sure the correct subdriver name is
printed later.

Fixes: 0c151062 ("sh-pfc: Add support for SoC-specific initialization")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>