bitmap: Step down as a reviewer

Too many things are going on, and reviewing BITMAP related code
seems not the best I can do, hence step down as a reviewer of
the BITMAP library.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>

MAINTAINERS

@@ -3553,7 +3553,6 @@ F:	include/uapi/linux/bfs_fs.h
 
 BITMAP API
 M:	Yury Norov <yury.norov@gmail.com>
-R:	Andy Shevchenko <andriy.shevchenko@linux.intel.com>
 R:	Rasmus Villemoes <linux@rasmusvillemoes.dk>
 S:	Maintained
 F:	include/linux/bitfield.h