pinctrl: renesas: rzg2l: Clean up and refactor OEN read/write functions

The variable naming in the various OEN functions has been confusing. We
were passing the _pin & bit variables from rzg2l_pinctrl_pinconf_get()
and rzg2l_pinctrl_pinconf_set() as the offset & pin argument to the
oen_read() and oen_write() functions. This doesn't make sense, the first
of these isn't actually an offset and the second is not needed for
RZ/V2H but leads to confusion with the bit variable used within these
functions.

To tidy this up, instead pass the _pin variable directly to the
oen_read() and oen_write() functions with consistent naming. Then
rzg3s_read_oen() and rzg3s_write_oen() can use macros to get the port
and pin numbers it needs.

Instead of passing the pin capabilities into oen_read() and oen_write(),
check that the pin supports OEN before calling these functions.

Also, merge rzg3s_oen_is_supported() into rzg3s_pin_to_oen_bit() to give
a single translation function which returns an error if the pin doesn't
support OEN. While we're here, remove an unnecessary branch and clarify
the variable naming. Lastly, check that we are not dealing with a
dedicated pin before calling RZG2L_PIN_ID_TO_{PORT,PIN}().

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20240625200316.4282-3-paul.barker.ct@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

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