Revert "Load env variables before c.config()"

This reverts commit 062b011502.

Reason for revert: This change is accidentally opting in a bunch of people into RBE because we aren't respecting USE_RBE variable in rvc-dev branch (possibly missing cherry-pick of some earlier fix).

Merged-In: I416e8da75f84aa2b53995f525cf50501488dc972
Change-Id: Ic678b63b165deb3ac4ec3d3c5cbc166621d8eec3

cmd/soong_ui/main.go

@@ -196,12 +196,13 @@ func main() {
 		Status:  stat,
 	}}
 
+	config := c.config(buildCtx, args...)
+
 	if err := loadEnvConfig(); err != nil {
 		fmt.Fprintf(os.Stderr, "failed to parse env config files: %v", err)
 		os.Exit(1)
 	}
 
-	config := c.config(buildCtx, args...)
 
 	build.SetupOutDir(buildCtx, config)