phy: cadence-torrent: Check cmn_ready assertion during PHY power on

commit 17d23fc583f72d0b7566d419372a8dcb46efa0c0 from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git

Check if cmn_ready is set after both PLL0 and PLL1 are locked.

Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>