Merge branch 'expose-refclk-for-rmii-and-enable-rmii'

Ryan Wanner says:

====================
Expose REFCLK for RMII and enable RMII

This set allows the REFCLK property to be exposed as a dt-property to
properly reflect the correct RMII layout. RMII can take an external or
internal provided REFCLK, since this is not SoC dependent but board
dependent this must be exposed as a DT property for the macb driver.

This set also enables RMII mode for the SAMA7 SoCs gigabit mac.

v1: https://lore.kernel.org/cover.1750346271.git.Ryan.Wanner@microchip.com
====================

Link: https://patch.msgid.link/cover.1752510727.git.Ryan.Wanner@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>