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
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
build: Fix PreBuilt Chromium refs

Change-Id: Icc553d5be1e71d8c754bc85b6906252e5690b508
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>