tracing: replace TP<var> with TP_<var>

Impact: clean up

The macros TPPROTO, TPARGS, TPFMT, TPRAWFMT, and TPCMD all look a bit
ugly. This patch adds an underscore to their names.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>

samples/tracepoints/tp-samples-trace.h

@@ -5,9 +5,9 @@
 #include <linux/tracepoint.h>
 
 DECLARE_TRACE(subsys_event,
-	TPPROTO(struct inode *inode, struct file *file),
-	TPARGS(inode, file));
+	TP_PROTO(struct inode *inode, struct file *file),
+	TP_ARGS(inode, file));
 DECLARE_TRACE(subsys_eventb,
-	TPPROTO(void),
-	TPARGS());
+	TP_PROTO(void),
+	TP_ARGS());
 #endif