Rename update_device.py's --disable-vabc param

update_device.py has a --disable-vabc option, and what it really does is
set virtual ab compression param to none, but still uses snapuserd.
There is also a --disable-vabc option in ota_from_target_files, which
completely disables virtual ab compression and fall back to plain vab.
To keep naming consistent, rename update_device.py's option to
--vabc-none.

Test: th
Change-Id: Ifba27f19ed8132bf1a3023481740461faa50207c
diff --git a/payload_consumer/install_plan.h b/payload_consumer/install_plan.h
index 926af98..8fe104a 100644
--- a/payload_consumer/install_plan.h
+++ b/payload_consumer/install_plan.h
@@ -73,7 +73,7 @@
       ErrorCode* error);
 
   bool is_resume{false};
-  bool disable_vabc{false};
+  bool vabc_none{false};
   std::string download_url;  // url to download from
   std::string version;       // version we are installing.