phy: xilinx: zynqmp: skip PHY initialization and PLL lock for USB

PHY initialization for USB is required on linux boot or when
gt lane is changed from the current one and it is applicable
on PLL lock too.

Signed-off-by: Piyush Mehta <piyush.mehta@xilinx.com>
Link: https://lore.kernel.org/r/20210818084311.2643986-1-piyush.mehta@xilinx.com


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