phy: cadence-torrent: Enable support for multiple subnodes

Enable support for multiple subnodes in torrent PHY to
include multi-link combinations.

Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Link: https://lore.kernel.org/r/1600280911-9214-4-git-send-email-sjakhade@cadence.com


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