[functorch] update discover coverage
diff --git a/functorch/test/discover_coverage.py b/functorch/test/discover_coverage.py
index 1bb6ab8..06b28bb 100644
--- a/functorch/test/discover_coverage.py
+++ b/functorch/test/discover_coverage.py
@@ -727,6 +727,7 @@
         exemptions = {
             # we have support (see OpInfo), testing artifact
             'nn.functional.dropout2d',
+            'nn.functional.dropout',
             # exception: we dont even support double backward for this
             'nn.functional.hardswish',
             'bernoulli',  # this isn't differentiable