phy: usb: Get all drivers that use USB clks using correct enable/disable

The BRCM USB Phy, ohci, ehci and xhci drivers all use the USB clocks
but not all drivers use the clk_prepare_enable/clk_disable_unprepare
versions to enable/disable the clocks. This change gets all drivers
using the prepare version.

Signed-off-by: Al Cooper <alcooperx@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>