Disable RBE in multiproduct_kati

RBE has signifigant performance overhead during
analysis time, in theory to reduce execution time.
But multiproduct_kati only tests analysis, and does
not run any execution, so RBE is just slowing us
down.

Bug: 229863781
Bug: 265603584
Test: time ./build/soong/build_test.bash  --products aosp_arm64 on stage_aosp_master
Change-Id: Icbb2f001fee03a75bad37c14d08a203be20ac6cf
diff --git a/cmd/multiproduct_kati/main.go b/cmd/multiproduct_kati/main.go
index 0115f4a..0212075 100644
--- a/cmd/multiproduct_kati/main.go
+++ b/cmd/multiproduct_kati/main.go
@@ -515,7 +515,8 @@
 		"TARGET_BUILD_VARIANT="+*buildVariant,
 		"TARGET_BUILD_TYPE=release",
 		"TARGET_BUILD_APPS=",
-		"TARGET_BUILD_UNBUNDLED=")
+		"TARGET_BUILD_UNBUNDLED=",
+		"USE_RBE=false") // Disabling RBE saves ~10 secs per product
 
 	if *alternateResultDir {
 		cmd.Env = append(cmd.Env,