usb: gadget: rndis: convert into module

In order to convert to configfs the usb functions need to be converted
to a new interface and compiled as modules. This patch creates an rndis
module which will be used by the new functions. After all users of
f_rndis are converted to the new interface, this module can be
merged with f_rndis module.

Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index d5ae4df..5345b68 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -502,6 +502,9 @@
 config USB_U_ETHER
 	tristate
 
+config USB_U_RNDIS
+	tristate
+
 config USB_F_SERIAL
 	tristate
 
@@ -599,6 +602,7 @@
 	depends on NET
 	select USB_LIBCOMPOSITE
 	select USB_U_ETHER
+	select USB_U_RNDIS
 	select CRC32
 	help
 	  This driver implements Ethernet style communication, in one of
@@ -724,6 +728,7 @@
 	bool "Include configuration with RNDIS (Ethernet)"
 	depends on USB_FUNCTIONFS && NET
 	select USB_U_ETHER
+	select USB_U_RNDIS
 	help
 	  Include a configuration with RNDIS function (Ethernet) and the Filesystem.
 
@@ -871,6 +876,7 @@
 	select USB_LIBCOMPOSITE
 	select USB_U_SERIAL
 	select USB_U_ETHER
+	select USB_U_RNDIS
 	select USB_F_ACM
 	help
 	  The Multifunction Composite Gadget provides Ethernet (RNDIS