Remove external/rust/crates/plotters/.gitmodules. am: f2c0a21474

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/plotters/+/1830443

Change-Id: I1a3b43b9f2363c79c88bf0f552b592421056cb3f
diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index 960b83b..0000000
--- a/.gitmodules
+++ /dev/null
@@ -1,3 +0,0 @@
-[submodule "plotters-doc-data"]
-	path = plotters-doc-data
-	url = https://github.com/38/plotters-doc-data