[bazel] Flip --enable_bzlmod to true (llvm#168555)

Switches to the config added in llvm#164891

Fixes llvm#55924

Author: rupprecht

utils/bazel/.bazelrc

@@ -7,9 +7,7 @@
 # Use sparingly for things common to all compilers and platforms.
 ###############################################################################
 
-# Flip off to disable MODULE.bazel until we're ready.
-# https://github.com/llvm/llvm-project/issues/55924
-common --enable_bzlmod=false --enable_workspace
+common --enable_bzlmod --noenable_workspace
 
 # TODO: Remove lit test reliance on this
 common --legacy_external_runfiles