KUnit: add missing MODULE_DESCRIPTION() macros for lib/*_test.ko

make allmodconfig && make W=1 C=1 reports for lib/*_test.ko:
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/atomic64_test.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/hashtable_test.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Jeff Johnson <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

lib/atomic64_test.c

···
 module_init(test_atomics_init);
 module_exit(test_atomics_exit);
 
+MODULE_DESCRIPTION("Testsuite for atomic64_t functions");
 MODULE_LICENSE("GPL");

lib/hashtable_test.c

···
 
 kunit_test_suites(&hashtable_test_module);
 
+MODULE_DESCRIPTION("KUnit test for the Kernel Hashtable structures");
 MODULE_LICENSE("GPL");