MAINTAINERS: Add bitfield.h to the BITMAP API record

From time to time changes are tending to go to bitfield.h
header while it may affect other bit operataions. Add
bitfiled.h to the BITMAP API record.

Signed-off-by: Andy Shevchenko <[email protected]>
Acked-by: Yury Norov <[email protected]>
Acked-by: Rasmus Villemoes <[email protected]>
Signed-off-by: Yury Norov <[email protected]>

Author: andy-shev

MAINTAINERS

@@ -3564,6 +3564,7 @@ M:	Yury Norov <[email protected]>
 R:	Andy Shevchenko <[email protected]>
 R:	Rasmus Villemoes <[email protected]>
 S:	Maintained
+F:	include/linux/bitfield.h
 F:	include/linux/bitmap.h
 F:	include/linux/bits.h
 F:	include/linux/cpumask.h
@@ -3576,6 +3577,7 @@ F:	lib/cpumask_kunit.c
 F:	lib/find_bit.c
 F:	lib/find_bit_benchmark.c
 F:	lib/test_bitmap.c
+F:	tools/include/linux/bitfield.h
 F:	tools/include/linux/bitmap.h
 F:	tools/include/linux/bits.h
 F:	tools/include/linux/find.h