lib: bitmap: add missing MODULE_DESCRIPTION() macros

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/find_bit_benchmark.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/cpumask_kunit.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_bitmap.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>

lib/cpumask_kunit.c

@@ -152,4 +152,5 @@ static struct kunit_suite test_cpumask_suite = {
 };
 kunit_test_suite(test_cpumask_suite);
 
+MODULE_DESCRIPTION("KUnit tests for cpumask");
 MODULE_LICENSE("GPL");

lib/find_bit_benchmark.c

@@ -194,4 +194,5 @@ static int __init find_bit_test(void)
 }
 module_init(find_bit_test);
 
+MODULE_DESCRIPTION("Test for find_*_bit functions");
 MODULE_LICENSE("GPL");

lib/test_bitmap.c

@@ -1486,4 +1486,5 @@ static void __init selftest(void)
 
 KSTM_MODULE_LOADERS(test_bitmap);
 MODULE_AUTHOR("david decotigny <david.decotigny@googlers.com>");
+MODULE_DESCRIPTION("Test cases for bitmap API");
 MODULE_LICENSE("GPL");