pinctrl: renesas: rzg2l: Clarify OEN read/write support

We currently support OEN read/write for the RZ/G3S SoC but not the
RZ/G2L SoC family (consisting of RZ/G2L, RZ/G2LC, RZ/G2UL, RZ/V2L &
RZ/Five). The appropriate functions are renamed to clarify this and to
match the callback names.

We should also only set the oen_read and oen_write function pointers for
the devices which support these operations. This requires us to check
that these function pointers are valid before calling them.

Signed-off-by: Paul Barker <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Geert Uytterhoeven <[email protected]>

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