perf tools: Add missing sources to perf's MANIFEST

Adding missing bitmap.[ch] sources to the MANIFEST file. Fixes building
'make perf-*-src-pkg' generated tarballs.
Reported-by: Wang Nan <wangnan0@huawei.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Fixes: 915b0882 ("tools lib: Move bitmap.[ch] from tools/perf/ to tools/{lib,include}/")
Link: http://lkml.kernel.org/r/1452509693-13452-5-git-send-email-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/MANIFEST

@@ -28,6 +28,7 @@ tools/lib/string.c
 tools/lib/symbol/kallsyms.c
 tools/lib/symbol/kallsyms.h
 tools/lib/find_bit.c
+tools/lib/bitmap.c
 tools/include/asm/atomic.h
 tools/include/asm/barrier.h
 tools/include/asm/bug.h
@@ -57,6 +58,7 @@ tools/include/linux/rbtree_augmented.h
 tools/include/linux/string.h
 tools/include/linux/types.h
 tools/include/linux/err.h
+tools/include/linux/bitmap.h
 include/asm-generic/bitops/arch_hweight.h
 include/asm-generic/bitops/const_hweight.h
 include/asm-generic/bitops/fls64.h