Add aarch64 entrypoints.

Author: Prabhuk

libc/config/baremetal/aarch64/entrypoints.txt

@@ -269,9 +269,8 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.time.difftime
     libc.src.time.gmtime
     libc.src.time.gmtime_r
-    # TODO: Re-enable these when tests aren't broken.
-    # libc.src.time.localtime
-    # libc.src.time.localtime_r
+    libc.src.time.localtime
+    libc.src.time.localtime_r
     libc.src.time.mktime
     libc.src.time.strftime
     libc.src.time.strftime_l