net: dwmac-imx: add imx93 clock input support in RMII mode

If the rmii_refclk_ext boolean is set, configure the ENET QOS TX_CLK pin
direction to input. Otherwise, it defaults to output.

That mirrors what is already happening for the imx8mp in the
imx8mp_set_intf_mode function.

Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
Link: https://patch.msgid.link/20241227095923.4414-1-othacehe@gnu.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>