Further shard android_debug_arm64 clang-tidy

Author: zanderso

ci/builders/linux_clang_tidy.json

@@ -173,7 +173,7 @@
                         "android_debug_arm64",
                         "--lint-all",
                         "--shard-id=0",
-                        "--shard-variants=host_debug"
+                        "--shard-variants=host_debug,host_debug,host_debug,host_debug"
                     ],
 		    "max_attempts": 1,
                     "script": "flutter/ci/lint.sh"