Prebuilt chromium: Run a check for target device directory

This should fix the issue that arises if device fails
and device is built again, chromium will error out because it thinks
the prebuilt files exist (which they are not, directories are just created).

Signed-off-by: Ayysir <ayysir@aospal.com>
Change-Id: I595cab268e66c738ccae9900150b36d7f9626a6e
Merge "Prebuilt chromium: Run a check for target device directory" into pac-5.0