HID: roccat: rename roccat_common functions to roccat_common2

Did this to illustrate my understanding of the firmware generations:
Valo and Kone were 1st generation
Arvo was externaly developed and lies in the middle
All others until now are considered 2nd generation

Signed-off-by: Stefan Achatz <erazor_de@users.sourceforge.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-roccat-common.h b/drivers/hid/hid-roccat-common.h
index 86bce05..a97746a 100644
--- a/drivers/hid/hid-roccat-common.h
+++ b/drivers/hid/hid-roccat-common.h
@@ -15,21 +15,21 @@
 #include <linux/usb.h>
 #include <linux/types.h>
 
-enum roccat_common_commands {
+enum roccat_common2_commands {
 	ROCCAT_COMMON_COMMAND_CONTROL = 0x4,
 };
 
-struct roccat_common_control {
+struct roccat_common2_control {
 	uint8_t command;
 	uint8_t value;
 	uint8_t request; /* always 0 on requesting write check */
 } __packed;
 
-int roccat_common_receive(struct usb_device *usb_dev, uint report_id,
+int roccat_common2_receive(struct usb_device *usb_dev, uint report_id,
 		void *data, uint size);
-int roccat_common_send(struct usb_device *usb_dev, uint report_id,
+int roccat_common2_send(struct usb_device *usb_dev, uint report_id,
 		void const *data, uint size);
-int roccat_common_send_with_status(struct usb_device *usb_dev,
+int roccat_common2_send_with_status(struct usb_device *usb_dev,
 		uint command, void const *buf, uint size);
 
 #endif