Strengthen dependencies on LOCAL_REQUIRED_MODULES

Bug: 6418863
This change expands the PRODUCT_PACKAGES with the required modules.
Before this change, since the required modules are not in the
PRODUCT_PACKAGES, they are not directly depended on by the image files.
If the dependent is not to be included in the image but the required
modules are to be included, the dependency of the image on the required
modules gets lost!
That would lead to build race condition.

Change-Id: I0b656db1538ca43d3785dbf17364ffa88b80ac41