phy: cadence-torrent: Add clk changes for multilink configuration

Prepare and enable clock in probe instead of phy_init.
Also, remove phy_exit callback.

Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Link: https://lore.kernel.org/r/1600327846-9733-8-git-send-email-sjakhade@cadence.com


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