usb: dwc3: Add dwc3 glue driver for am62

Add glue code for TI AM62 to the dwc3 driver; Most code adopted from
TI vendor u-boot code.

Signed-off-by: Sjoerd Simons <sjoerd@collabora.com>
Tested-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Tested-by: Mattijs Korpershoek <mkorpershoek@baylibre.com> # on beagle play
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index 97b4f71..a46b682 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -6,6 +6,7 @@
 
 obj-$(CONFIG_USB_DWC3_GADGET)		+= gadget.o ep0.o
 
+obj-$(CONFIG_$(SPL_)USB_DWC3_AM62)	+= dwc3-am62.o
 obj-$(CONFIG_USB_DWC3_OMAP)		+= dwc3-omap.o
 obj-$(CONFIG_USB_DWC3_MESON_G12A)	+= dwc3-meson-g12a.o
 obj-$(CONFIG_USB_DWC3_MESON_GXL)	+= dwc3-meson-gxl.o