Merge branch 'make-phy-output-rmii-reference-clock'

Wei Fang says:

====================
make PHY output RMII reference clock

The TJA11xx PHYs have the capability to provide 50MHz reference clock
in RMII mode and output on REF_CLK pin. Therefore, add the new property
"nxp,rmii-refclk-output" to support this feature. This property is only
available for PHYs which use nxp-c45-tja11xx driver, such as TJA1103,
TJA1104, TJA1120 and TJA1121.
====================

Link: https://patch.msgid.link/20241010061944.266966-1-wei.fang@nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>