envsetup: Fix check for deprecated CM device tree

By the time lunch is run on a product name, it's too late to check
whether a deprecated CM device tree is being used (roomservice runs in
lunch). Instead, rely on check_product() to identify whether a tree
uses cm_ or lineage_ before running lunch.

Change-Id: I16288365f791ff68c3226f3808427168b2fc06fa
1 file changed