usb: common: move urb code to common

Move urb code from musb only use to a more common scope, so other
drivers in the future can use the handling of urb in usb.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
diff --git a/drivers/usb/common/Makefile b/drivers/usb/common/Makefile
index 3bedbf2..7eacc90 100644
--- a/drivers/usb/common/Makefile
+++ b/drivers/usb/common/Makefile
@@ -4,5 +4,8 @@
 #
 
 obj-$(CONFIG_$(SPL_)DM_USB) += common.o
+obj-$(CONFIG_USB_MUSB_HOST) += usb_urb.o
+obj-$(CONFIG_USB_MUSB_GADGET) += usb_urb.o
+obj-$(CONFIG_USB_R8A66597_HCD) += usb_urb.o
 obj-$(CONFIG_USB_EHCI_FSL) += fsl-dt-fixup.o fsl-errata.o
 obj-$(CONFIG_USB_XHCI_FSL) += fsl-dt-fixup.o fsl-errata.o