kcm: Remove TCP specific references from kcm and strparser

kcm and strparser need to work with any type of stream socket not just
TCP. Eliminate references to TCP and call generic proto_ops functions of
read_sock and peek_len. Also in strp_init check if the socket support
the proto_ops read_sock and peek_len.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/strparser.h b/include/net/strparser.h
index 91fa0b9..0c28ad9 100644
--- a/include/net/strparser.h
+++ b/include/net/strparser.h
@@ -137,6 +137,6 @@
 void strp_check_rcv(struct strparser *strp);
 int strp_init(struct strparser *strp, struct sock *csk,
 	      struct strp_callbacks *cb);
-void strp_tcp_data_ready(struct strparser *strp);
+void strp_data_ready(struct strparser *strp);
 
 #endif /* __NET_STRPARSER_H_ */