Avoid including vm.h header in tests.

Bug: 115484857
Change-Id: I3145826c057d28ddab2c830361a5881e4455f016
diff --git a/build/toolchain/platform.gni b/build/toolchain/platform.gni
index 8e9feea..4e30a1b 100644
--- a/build/toolchain/platform.gni
+++ b/build/toolchain/platform.gni
@@ -28,5 +28,5 @@
   plat_max_cpus = 1
 
   # The maximum number of VMs required for the platform.
-  plat_max_vms = 1
+  plat_max_vms = 0
 }