pinctrl: renesas: rzg2l: Suppress binding attributes

Suppress binding attributes for the rzg2l pinctrl driver, as it is an
essential block for Renesas SoCs.  Unbinding the driver leads to
warnings from __device_links_no_driver() and can eventually render the
system inaccessible.

Fixes: c4c4637e ("pinctrl: renesas: Add RZ/G2L pin and gpio controller driver")
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250215131235.228274-1-claudiu.beznea.uj@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>