phy: Add USB3 PHY support for Intel LGM SoC

Add support for USB PHY on Intel LGM SoC.

Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20200828022312.52724-3-vadivel.muruganx.ramuthevar@linux.intel.com


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