Merge branch 'net-stmmac-thead-clean-up-clock-rate-setting'

Russell King says:

====================
net: stmmac: thead: clean up clock rate setting

This series cleans up the thead clock rate setting to use the
rgmii_clock() helper function added to phylib.

The first patch switches over to using the rgmii_clock() helper,
and the second patch cleans up the verification that the desired
clock rate is achievable, allowing the private clock rate
definitions to be removed.
====================

Tested-by: Drew Fustini <drew@pdp7.com>
Link: https://patch.msgid.link/Z7iKdaCp4hLWWgJ2@shell.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>