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-isku.c b/drivers/hid/hid-roccat-isku.c
index 20e7f84..5669916 100644
--- a/drivers/hid/hid-roccat-isku.c
+++ b/drivers/hid/hid-roccat-isku.c
@@ -36,7 +36,7 @@
 static int isku_receive(struct usb_device *usb_dev, uint command,
 		void *buf, uint size)
 {
-	return roccat_common_receive(usb_dev, command, buf, size);
+	return roccat_common2_receive(usb_dev, command, buf, size);
 }
 
 static int isku_get_actual_profile(struct usb_device *usb_dev)
@@ -56,7 +56,7 @@
 	buf.command = ISKU_COMMAND_ACTUAL_PROFILE;
 	buf.size = sizeof(struct isku_actual_profile);
 	buf.actual_profile = new_profile;
-	return roccat_common_send_with_status(usb_dev,
+	return roccat_common2_send_with_status(usb_dev,
 			ISKU_COMMAND_ACTUAL_PROFILE, &buf,
 			sizeof(struct isku_actual_profile));
 }
@@ -154,7 +154,7 @@
 		return -EINVAL;
 
 	mutex_lock(&isku->isku_lock);
-	retval = roccat_common_send_with_status(usb_dev, command,
+	retval = roccat_common2_send_with_status(usb_dev, command,
 			(void *)buf, real_size);
 	mutex_unlock(&isku->isku_lock);