[JFFS2][XATTR] coexistence between xattr and write buffering support.

Drop '&& !JFFS2_FS_WRITEBUFFER' from fs/Kconfig.
The series of previous patches enables to use those
functionality at same time.
Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

fs/Kconfig

@@ -1116,7 +1116,7 @@ config JFFS2_SUMMARY
 
 config JFFS2_FS_XATTR
 	bool "JFFS2 XATTR support (EXPERIMENTAL)"
-	depends on JFFS2_FS && EXPERIMENTAL && !JFFS2_FS_WRITEBUFFER
+	depends on JFFS2_FS && EXPERIMENTAL
 	default n
 	help
 	  Extended attributes are name:value pairs associated with inodes by