PCI: imx6: Call common PHY API to set mode, speed, and submode

Invoke the common PHY API to configure mode, speed, and submode. While
these functions are optional in the PHY interface, they are necessary for
certain PHY drivers. Lack of support for these functions in a PHY driver
does not cause harm.

Link: https://lore.kernel.org/linux-pci/20240729-pci2_upstream-v8-10-b68ee5ef2b4d@nxp.com


Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>