dt-bindings: phy: Add i.MX8Q HSIO SerDes PHY binding

Add i.MX8QM and i.MX8QXP HSIO SerDes PHY binding.
Introduce one HSIO configuration 'fsl,hsio-cfg', which need be set at
initialization according to board design.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/1716962565-2084-2-git-send-email-hongxing.zhu@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>