[bazel] fix/add patches to enable downstream builds

The opentitan-provisioning loads this repo as a bazel dependency to build
opentitanlib. Minor updates to rules rust in this repo broke builds
downstream. This should fix them.

Signed-off-by: Tim Trippel <ttrippel@google.com>
(cherry picked from commit 6e8e395)

Author: timothytrippel

MODULE.bazel

@@ -49,6 +49,7 @@ single_version_override(
     module_name = "rules_rust",
     patch_strip = 1,
     patches = [
+        "@lowrisc_opentitan//third_party/rust/patches:rules_rust.experimental.patch",
         "@lowrisc_opentitan//third_party/rust/patches:rules_rust.extra_rustc_toolchain_dirs.patch",
     ],
     version = "0.59.2",
@@ -59,6 +60,7 @@ single_version_override(
     patch_strip = 3,
     patches = [
         "@lowrisc_opentitan//third_party/rust/patches:rules_rust.bindgen_static_lib.patch",
+        "@lowrisc_opentitan//third_party/rust/patches:rules_rust.transition.patch",
     ],
     version = "0.59.2",
 )

MODULE.bazel.lock

@@ -0,0 +1,15 @@
+diff --git a/rust/private/rustc.bzl b/rust/private/rustc.bzl
+--- a/rust/private/rustc.bzl
++++ b/rust/private/rustc.bzl
+@@ -1518,11 +1518,6 @@ def rustc_compile_action(
+         "source_attributes": ["srcs"],
+     }
+ 
+-    if experimental_use_coverage_metadata_files:
+-        instrumented_files_kwargs.update({
+-            "metadata_files": coverage_runfiles + [executable] if executable else [],
+-        })
+-
+     providers = [
+         DefaultInfo(
+             # nb. This field is required for cc_library to depend on our output.

third_party/rust/patches/rules_rust.experimental.patch

@@ -0,0 +1,13 @@
+diff --git a/extensions/bindgen/private/llvm_utils.bzl b/extensions/bindgen/private/llvm_utils.bzl
+--- a/extensions/bindgen/private/llvm_utils.bzl
++++ b/extensions/bindgen/private/llvm_utils.bzl
+@@ -42,6 +42,9 @@ _COMMON_ATTRS = {
+         doc = "The target to transition.",
+         mandatory = True,
+     ),
++    "_allowlist_function_transition": attr.label(
++        default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
++    ),
+ }
+ 
+ def _cc_stdcc17_transitioned_target_impl(ctx):