Fix tools/bazel PATH in bazelrc 1. Doesn't depend on OUT_DIR=out 2. Works when bazel is invoked underneath the workspace root (such as the symlink tree out/soong/workspace Bug: 233946973 Test: Manually verified bazel actions to have the accurate path_interposer location Test: mixed_libc.sh CI script Change-Id: I6fe1298aafa01fecfaa4c16a08b30dd81fe63bbc