USB: cns3xxx: Add EHCI and OHCI bus glue for cns3xxx SOCs

The CNS3XXX SOC has include USB EHCI and OHCI compatible controllers.
This patch adds the necessary glue logic to allow ehci-hcd and ohci-hcd
drivers to work on CNS3XXX

The EHCI and OHCI controllers share a common clock control and reset
bit, therefore additional check for the timming of enabling and disabling
is required. The USB bit of PLL Power Down Control is also shared by OTG,
24MHzUART clock, Crypto clock, PCIe reference clock, and Clock Scale
Generator. Therefore we only ensure it is enabled, while not disabling it.

Signed-off-by: Mac Lin <mkl0301@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

drivers/usb/Kconfig

@@ -41,6 +41,7 @@ config USB_ARCH_HAS_OHCI
 	default y if MFD_TC6393XB
 	default y if ARCH_W90X900
 	default y if ARCH_DAVINCI_DA8XX
+	default y if ARCH_CNS3XXX
 	# PPC:
 	default y if STB03xxx
 	default y if PPC_MPC52xx
@@ -66,6 +67,7 @@ config USB_ARCH_HAS_EHCI
 	default y if ARCH_AT91SAM9G45
 	default y if ARCH_MXC
 	default y if ARCH_OMAP3
+	default y if ARCH_CNS3XXX
 	default PCI
 
 # ARM SA1111 chips have a non-PCI based "OHCI-compatible" USB host interface.