Add support for MODULES_BUILD_FROM_SOURCE for consistency with am: 7ce695ca8a

Original change: https://android-review.googlesource.com/c/platform/prebuilts/module_sdk/Connectivity/+/1907937

Change-Id: I27769114a3da9dff96f8cb7e1c857f6cb3550a86
tree: 2dfed315632295e4a2c1f9d1cb2a664872ad9601
  1. .prebuilt_info/
  2. 1/
  3. current/
  4. OWNERS