btrfs: include trace header in where necessary

If we no longer include the tracepoints from ctree.h we fail to compile
because we have the dependency in some of the header files and source
files.  Add the include where we have these dependencies to allow us to
remove the include from ctree.h.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/async-thread.c

@@ -9,6 +9,7 @@
 #include <linux/list.h>
 #include <linux/spinlock.h>
 #include <linux/freezer.h>
+#include <trace/events/btrfs.h>
 #include "async-thread.h"
 #include "ctree.h"
 

fs/btrfs/btrfs_inode.h

@@ -9,6 +9,7 @@
 #include <linux/hash.h>
 #include <linux/refcount.h>
 #include <linux/fscrypt.h>
+#include <trace/events/btrfs.h>
 #include "extent_map.h"
 #include "extent_io.h"
 #include "ordered-data.h"

fs/btrfs/locking.c

@@ -8,6 +8,7 @@
 #include <linux/spinlock.h>
 #include <linux/page-flags.h>
 #include <asm/bug.h>
+#include <trace/events/btrfs.h>
 #include "misc.h"
 #include "ctree.h"
 #include "extent_io.h"

fs/btrfs/space-info.h

@@ -3,6 +3,7 @@
 #ifndef BTRFS_SPACE_INFO_H
 #define BTRFS_SPACE_INFO_H
 
+#include <trace/events/btrfs.h>
 #include "volumes.h"
 
 /*