Revert "Map in Rust support"

This reverts commit 2d5e22bee78154037ef1d82b3eb1b7d8c6a4b510.

Reason for revert: Landing in 6.6 branch instead.

Change-Id: I1b2e3e35279738e99df9e0c883a57d389ea92172
diff --git a/default.xml b/default.xml
index f3a3727..9e9fd4a 100644
--- a/default.xml
+++ b/default.xml
@@ -20,7 +20,6 @@
   <project path="prebuilts/build-tools" name="platform/prebuilts/build-tools" clone-depth="1" />
   <project path="prebuilts/clang-tools" name="platform/prebuilts/clang-tools" clone-depth="1" />
   <project path="prebuilts/kernel-build-tools" name="kernel/prebuilts/build-tools" clone-depth="1" />
-  <project path="prebuilts/rust" name="platform/prebuilts/rust" clone-depth="1" revision="main-kernel"/>
   <project path="tools/mkbootimg" name="platform/system/tools/mkbootimg" />
 
   <project path="prebuilts/bazel/linux-x86_64" name="platform/prebuilts/bazel/linux-x86_64" clone-depth="1" />
@@ -29,7 +28,6 @@
 
   <project path="external/bazel-skylib" name="platform/external/bazel-skylib" />
   <project path="build/bazel_common_rules" name="platform/build/bazel_common_rules" />
-  <project path="external/bazelbuild-rules_rust" name="platform/external/bazelbuild-rules_rust" revision="main" />
   <project path="external/stardoc" name="platform/external/stardoc" />
   <project path="external/python/absl-py" name="platform/external/python/absl-py" />
 </manifest>