pinctrl: renesas: rzg2l: Drop unnecessary pin configurations

pinctrl: renesas: rzg2l: Drop unnecessary pin configurations

There is no need to reconfigure a pin if the pin's configuration
values are the same as the reset values.  E.g. the PS0 pin configuration
for the NMI function is PMC = 1 and PFC = 0, which is the same as the
reset values.  Currently the code is first setting it to GPIO HI-Z state
and then again reconfiguring to the NMI function, leading to spurious
IRQs.  Fix this by dropping unnecessary pin configuration from the
driver.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20250909104247.3309-1-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>