phy: cadence-torrent: add suspend and resume support

Add suspend and resume support.

The already_configured flag is cleared during the suspend stage to force
the PHY initialization during the resume stage.

Co-developed-by: Théo Lebrun <theo.lebrun@bootlin.com>
Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
Link: https://lore.kernel.org/r/20240412-j7200-phy-s2r-v1-8-f15815833974@bootlin.com


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