l2tp: remove custom logging macros

All l2tp's informational and warning logging is now carried out using
standard kernel APIs.

Debugging information is now handled using tracepoints.

Now that no code is using the custom logging macros, remove them from
l2tp_core.h.
Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/l2tp/l2tp_core.h

@@ -339,19 +339,6 @@ static inline int l2tp_v3_ensure_opt_in_linear(struct l2tp_session *session, str
 	return 0;
 }
 
-#define l2tp_printk(ptr, type, func, fmt, ...)				\
-do {									\
-	if (((ptr)->debug) & (type))					\
-		func(fmt, ##__VA_ARGS__);				\
-} while (0)
-
-#define l2tp_warn(ptr, type, fmt, ...)					\
-	l2tp_printk(ptr, type, pr_warn, fmt, ##__VA_ARGS__)
-#define l2tp_info(ptr, type, fmt, ...)					\
-	l2tp_printk(ptr, type, pr_info, fmt, ##__VA_ARGS__)
-#define l2tp_dbg(ptr, type, fmt, ...)					\
-	l2tp_printk(ptr, type, pr_debug, fmt, ##__VA_ARGS__)
-
 #define MODULE_ALIAS_L2TP_PWTYPE(type) \
 	MODULE_ALIAS("net-l2tp-type-" __stringify(type))