usb: move usb/usb-common.c to usb/common/usb-common.c

Since we will have more usb-common things, and it will let
usb-common.c be larger and larger, we create a folder named usb/common
for all usb common things.

Cc: Felipe Balbi <balbi@ti.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index 9bb6721..3cba892 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -59,4 +59,4 @@
 obj-$(CONFIG_USB_RENESAS_USBHS)	+= renesas_usbhs/
 obj-$(CONFIG_USB_GADGET)	+= gadget/
 
-obj-$(CONFIG_USB_COMMON)	+= usb-common.o
+obj-$(CONFIG_USB_COMMON)	+= common/
diff --git a/drivers/usb/common/Makefile b/drivers/usb/common/Makefile
new file mode 100644
index 0000000..9b320d1
--- /dev/null
+++ b/drivers/usb/common/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the usb common parts.
+#
+
+obj-$(CONFIG_USB_COMMON) += usb-common.o
diff --git a/drivers/usb/usb-common.c b/drivers/usb/common/usb-common.c
similarity index 100%
rename from drivers/usb/usb-common.c
rename to drivers/usb/common/usb-common.c