dm: Don't undefine dev_xxx macros

Now that linux/compat.h does not define these macros, we do not need to
undefine them.
Signed-off-by: NSean Anderson <seanga2@gmail.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

include/dm/device_compat.h

@@ -15,26 +15,6 @@
 #include <linux/build_bug.h>
 #include <linux/compat.h>
 
-/*
- * REVISIT:
- * remove the following after resolving conflicts with <linux/compat.h>
- */
-#ifdef dev_dbg
-#undef dev_dbg
-#endif
-#ifdef dev_vdbg
-#undef dev_vdbg
-#endif
-#ifdef dev_info
-#undef dev_info
-#endif
-#ifdef dev_err
-#undef dev_err
-#endif
-#ifdef dev_warn
-#undef dev_warn
-#endif
-
 /*
  * Define a new identifier which can be tested on by C code. A similar
  * definition is made for DEBUG in <log.h>.