net: qualcomm: rmnet: Remove unused function declaration

rmnet_map_demultiplex() is only declared but not defined anywhere,
so remove it.
Signed-off-by: NSubash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h

@@ -67,7 +67,6 @@ struct rmnet_map_header {
 #define RMNET_MAP_NO_PAD_BYTES        0
 #define RMNET_MAP_ADD_PAD_BYTES       1
 
-u8 rmnet_map_demultiplex(struct sk_buff *skb);
 struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb);
 struct rmnet_map_header *rmnet_map_add_map_header(struct sk_buff *skb,
 						  int hdrlen, int pad);