usb: dwc3: Add phy interface for dwc3_uboot

U-Boot has two different variants of dwc3 initializations,
- with dm variant gadget, so the respective dm driver would
  call the dwc3_init in core.
- with non-dm variant gadget, so the usage board file would
  call dwc3_uboot_init in core.

The driver probe would handle all respective gadget properties
including phy interface via phy_type property and then trigger
dwc3_init for dm-variant gadgets.

So, to support the phy interface for non-dm variant gadgets,
the better option is dwc3_uboot_init since there is no
dedicated controller for non-dm variant gadgets.

This patch support for adding phy interface like 8/16-bit UTMI+
code for dwc3_uboot.

This change used Linux phy.h enum list, to make proper code
compatibility.

Cc: Marek Vasut <marex@denx.de>
Tested-by: Levin Du <djw@t-chip.com.cn>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

include/dwc3-uboot.h

@@ -10,10 +10,12 @@
 #define __DWC3_UBOOT_H_
 
 #include <linux/usb/otg.h>
+#include <linux/usb/phy.h>
 
 struct dwc3_device {
 	unsigned long base;
 	enum usb_dr_mode dr_mode;
+	enum usb_phy_interface hsphy_mode;
 	u32 maximum_speed;
 	unsigned tx_fifo_resize:1;
 	unsigned has_lpm_erratum;