Use ro.product.vendor.device to determine if running on Cuttlefish

Similar reasoning as aosp/2255456. ro.product.device could be overridden
by GSI if system.img was replaced with GSI.
Use ro.product.vendor.device, which comes from the vendor.img, to
determine the "device" type.

Bug: 243116800
Test: adb-remount-test on cuttlefish
Change-Id: Ib4a956047ef46d8e4837b27334f8d58162d4fa2a
diff --git a/fs_mgr/tests/adb-remount-test.sh b/fs_mgr/tests/adb-remount-test.sh
index eba4f6e..68f8152 100755
--- a/fs_mgr/tests/adb-remount-test.sh
+++ b/fs_mgr/tests/adb-remount-test.sh
@@ -1423,7 +1423,7 @@
 
 is_bootloader_fastboot=true
 # cuttlefish?
-[[ "$(get_property ro.product.device)" == vsoc* ]] &&
+[[ "$(get_property ro.product.vendor.device)" == vsoc_* ]] &&
   is_bootloader_fastboot=false
 is_userspace_fastboot=false