Remove memberMutator and use DepsMutator instead

Previously, the memberMutator was responsible for adding dependencies
from the sdk to its members. It could not just implement DepsMutator()
as it had to be run before the memberDepsMutator which itself had to be
run before the depsMutator.

As the memberDepsMutator has been removed by a previous change this
change removes the memberMutator and just performs that functionality
in the standard DepsMutator(BottomMutatorContext) method.

Bug: 260237150
Test: m nothing
      BUILD_NUMBER=fixed packages/modules/common/build/mainline_modules_sdks.sh
      # Run the above before and after this change and compare the
      # out/dist/*mainline-sdks directory contents to ensure that there are no
      # changes.
Change-Id: I264bdeee84f2349e30e5c24dd4861e945640d020