Update rbesetup.sh script to no longer set certain env variables

These environment variables are no longer needed to be set explicitly.
Soong can set reasonable defaults for these variables.

Bug: b/233382420
Change-Id: Ie07e93a68b9d7fa6de576efd976c208761ee0063
diff --git a/rbesetup.sh b/rbesetup.sh
index 3b0e7cf..8386628 100644
--- a/rbesetup.sh
+++ b/rbesetup.sh
@@ -33,20 +33,15 @@
 # This function prefixes the given command with appropriate variables needed
 # for the build to be executed with RBE.
 function use_rbe() {
-  local RBE_LOG_DIR="/tmp"
   local RBE_BINARIES_DIR="prebuilts/remoteexecution-client/latest"
   local DOCKER_IMAGE="gcr.io/androidbuild-re-dockerimage/android-build-remoteexec-image@sha256:582efb38f0c229ea39952fff9e132ccbe183e14869b39888010dacf56b360d62"
 
   # Do not set an invocation-ID and let reproxy auto-generate one.
   USE_RBE="true" \
-  FLAG_server_address="unix:///tmp/reproxy_$RANDOM.sock" \
   FLAG_exec_root="$(gettop)" \
   FLAG_platform="container-image=docker://${DOCKER_IMAGE}" \
   RBE_use_application_default_credentials="true" \
-  RBE_log_dir="${RBE_LOG_DIR}" \
   RBE_reproxy_wait_seconds="20" \
-  RBE_output_dir="${RBE_LOG_DIR}" \
-  RBE_log_path="text://${RBE_LOG_DIR}/reproxy_log.txt" \
   RBE_CXX_EXEC_STRATEGY="remote_local_fallback" \
   RBE_cpp_dependency_scanner_plugin="${RBE_BINARIES_DIR}/dependency_scanner_go_plugin.so" \
   RBE_DIR=${RBE_BINARIES_DIR} \