phy: ti: j721e-wiz: Add support for configuring QSGMII

Configure MAC clock dividers required for QSGMII to be functional.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Link: https://lore.kernel.org/r/1614838096-32291-3-git-send-email-sjakhade@cadence.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>