btrfs_tree.h: fix include from userland

This patch prepares the uapi export by fixing the following errors:

.../linux/btrfs_tree.h:283:2: error: #error "UUID items require BTRFS_UUID_SIZE == 16!"
#error "UUID items require BTRFS_UUID_SIZE == 16!"

.../linux/btrfs_tree.h:390:12: error: ‘BTRFS_UUID_SIZE’ undeclared here (not in a function)
__u8 uuid[BTRFS_UUID_SIZE];
^
.../linux/btrfs_tree.h:796:16: error: ‘BTRFS_DEV_STAT_VALUES_MAX’ undeclared here (not in a function)
__le64 values[BTRFS_DEV_STAT_VALUES_MAX];

Signed-off-by: Nicolas Dichtel <[e-mail]>
Signed-off-by: Masahiro Yamada <[e-mail]>

include/uapi/linux/btrfs_tree.h

···
 #ifndef _BTRFS_CTREE_H_
 #define _BTRFS_CTREE_H_
 
+#include <linux/btrfs.h>
 #include <linux/types.h>
 
 /*