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Set RMII reference clock output to enabled (1) by default for VSC8541 PHY in RMII mode. The RMII specification requires a 50MHz reference clock, and many board designs expect the PHY to provide this clock to the MAC controller. Previously, the driver defaulted rmii_clk_out to 0 (disabled) for all interface modes, which caused the PHY to not output the required 50MHz clock. This resulted in MAC-PHY communication failures and prevented network operations like DHCP from working on RMII-configured boards. This change alligns with the hardware power-up default behavior and aligns with both the generic PHY driver and Linux MSCC PHY driver implementations. Signed-off-by: Pranav Tilak <pranav.vinaytilak@amd.com> Signed-off-by: Michal Simek <michal.simek@amd.com> Link: https://lore.kernel.org/r/20260129081054.1703479-1-pranav.vinaytilak@amd.com