phy: add driver for Qualcomm IPQ40xx USB PHY

Add a driver to setup the USB PHY-s on Qualcom m IPQ40xx series SoCs.
The driver sets up HS and SS phys.

Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Link: https://lore.kernel.org/r/20200503201823.531757-1-robert.marko@sartura.hr
Signed-off-by: Vinod Koul <vkoul@kernel.org>