pinctrl: renesas: rzg2l: Add support to select power source for Ethernet pins

The GPIO controller available on RZ/G3S (but also on RZ/G2L) supports
setting the power source for Ethernet pins.  Based on the interface b/w
the Ethernet controller and the Ethernet PHY, and on board design, a
specific power source needs to be selected.  The GPIO controller
supports 1.8V, 2.5V, and 3.3V power source selection for the Ethernet
pins.  This can be selected though the ETHx_POC registers (x={0, 1}).

Adjust the driver to support this, and to do proper instantiation for
the RZ/G3S and RZ/G2L SoCs.  On RZ/G2L only the get operation has been
tested at the moment.

While at it, as the power registers on RZ/G2L support access sizes of 8
bits, and these registers on RZ/G3S support access sizes of 8/16/32
bits, replace writel()/readl() on these registers with writeb()/readb().
This should allow us to use the same code on both SoCs w/o any issues.

Signed-off-by: Claudiu Beznea <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Geert Uytterhoeven <[email protected]>

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